Strategic use of resources

This was submitted to brainmass earlier, and I received some help but I still have questions. I post the outline I am using for this problem. I paste the previously answer.
A company produces to a seasonal demand, with the forecast for the next 12 months as given below.

The present labor force can produce 500 units per month. Each employee added can produce an additional 20 units per month and is paid $1000 per month. The cost of materials is $30 per unit. Overtime can be used at the usual premium of time and a half for labor up to a maximum of 10 percent per month. Inventory-carrying cost is $50 per unit per year. Changes in production level cost $100 per unit due to hiring, line changeover costs, and so forth. Assume 200 units of initial inventory. Extra capacity may be obtained by subcontracting at an additional cost of $15 per unit over and above the company's producing them itself on regular time.

Provide a detailed cost breakdown for using a level vs. a chase strategy to meet the increased demand. Which strategy do you recommend? How much savings would result from the plan you recommend?

Month                                  Demand
January                               600
February                              700
March                                  800
April                                    700
May                                     600
June                                    500
July                                     600
August                                 700
September                           800
October                               900
November                            700
December                            600

This how I outline the problem
Figure-1 CHASE Strategy

CHASE JAN   FEB MAR APR MAY JUN JUL AUG
                SEPT OCT NOV DEC
Forecast Demand 600 700 800 700 600 500 600 700 800 900 700 600

Output Regular  Production 500 500 500 500 500 500 500 500 500 500 500 500

Extra Production- I am having problems getting the extra production for each month
Total Production- How do I get the total production for each month?
Resources Regular Workers for each month- 25 25 25 25 25 25 25 25 25 25 25 25

Chase RegularWorkers- ( How do you calculate this answer for each month? I keep coming-up with something different.
Total Regular Workers for each month- ?
Inventory 200 200 200 200 200 200 200 200 200 200 200 200

Costs
Regular wage for each month-
Chase Regular wage for eachmonth-
Total
Wages for each month-
ICC -
Material-
CiP-



Figure-2 LEVEL Strategy

LEVEL JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Total
Forecast
Demand 600 700 800 700 600 500 600 700 800 900 700 600

Output Regular
Production 500 500 500 500 500 500 500 500 500 500 500 500

Extra Production- (how do I calculate this?)
Total Production for each month-

Resources
Regular Workers 25 25 25 25 25 25 25 25 25 25 25 25

O/T Workers for each month-
Subcontract Workers for each month-
Total Workers-
Starting Inventory- 200
Ending Inventory-

Costs-
Regular Wages each month-
O/T Wages each month-
Subcontractor Wages-
Total Wages-

ICC-
Material-
CiP-
I need to do a thorough analysis of the possible alternative strategies for Chase and Level methods and provide the one most cost effective strategy for each.   I need to make sure I compare costs for each option and total them annually.


This is the reponse I received from Brainmass. I am still not clear how the answers were calculated. I have a problem on how to get the formula to the calculations.


Inventory Subcontracting Cost Changing cost Inventory cost
January 600           500+200                     100
February 700           500                 -100                    15,000
March 800           700           -100       15,000    20,000
April 700           700             0
May 600           700            100
June 500           700            300
July 600           700            400
August 700          700            400
September 800          700            300
October 900          700           100
November 700          700           100
December 600            700         200

                                                                30,000                           20,000                                                                   8333.333333                                                                         58,333 Total
Chase Strategy
Month Demand Diff.in.Prod Changeover Cost Inventory cost
January 600         -100                                 0
February 700 100                             10000
March 800 300                             20000
April 700 200                             10000
May 600 100                             10000
June 500 0                             10000
July 600 100                             10000
August 700 200                             10000
September 800 300                             10000
October 900 400                             10000
November 700 200                             20000
December 600 100                             10000
130000          416.6666667                                           130416.6667                                                   Total

Savings= 72,083