The aggregate demand for a product line for the next 6 months is given below. The firm has regular capacity of 150 units per month, overtime capacity for 40 more units per month, and subcontracting can supply up to 100 units per month. The chase policy is being used. Find the numbers of units produced during regular time, overtime, and through subcontracting in each month.

Month 1 2 3 4 5 6 Demand 200 130 180 220 210 190