please write step by step because I did not Understanding

Example on Aggregate Planning M/s ABC Ltd has projected sales of 300, 500, 406, 106, 200 and 300 for the six months Jan to June and the number of working days in the corresponding month are 22, 19, 21, 21, 22 & 20 respectively. The company at present employs 20 workers and Veach unit requires 10 labour hours for its production. The niring costs are Rs 300 and layoff costs are Rs 400 per person. Company policy is to retain a safety stock equal to 20% of the monthly forecast. There are currently 50 units in stock carried 3: Rs 2/- per unit - month. Stock outs have been assigned a cost of Rs.20/- per unit - month. Labour cost/hr is Rs 6/- and $ 9/- on regular & 0.T. basis respectively. Suggest an gregate plan based upon the following strategies:- 1. Chase 2. Constant Work force of 20 & using O.T. & Idle times to meet the demand 3. Constant Workforce of 20 & build inventory /occur stock out sost. OOO