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please help to answer numbers 72, 73, 74, 75 & 76

Given the projected demands for the next six months, prepare an aggregate plan that uses inventory, regular time and overtime, and backorders. The plan must wind up with no units in ending inventory in Period 6. Regular time capacity is 150 units per month. Overtime capacity is 20 units per month. Overtime cost is $30 per unit, backorder cost is $20 per unit, inventory holding cost is $5 per unit, regular time cost of $20 per unit, and beginning inventory is zero. Month Forecast 180 170 140 150 1 2 3 4 5 6 130 150 A firm has 43 units of a certain product on hand. Forecasts for the first two planning periods are 20 units each. A production quantity of 80 units is planned to be available in period 3. Customer orders are 22 for period 1 and 17 for period 2. 72. What is the projected on-hand inventory at the end of period 2? A. 21 B. 1 C. 12 D. 20 E. impossible to say without more information 73. What quantity is available for commitment to new customers in either of the first two periods? A. 21 B. 1 C. 20 D. 4 E. impossible to say without more information A firm has 56 units of product X on hand. Forecasts of demand are for 20 units per week. An MPS quantity of 100 units is planned to arrive in period 3. Customer orders are 24 for period 1, 18 for period 2, and 15 for period 3. 74. What is the projected on hand inventory at the end of period 2? A. 14 B. 32 C. 12 D. 20 E. impossible to say without additional information 75. What quantity is available for commitment to new customers prior to the receipt of the MPS quantity in week 3? A. 14 B. 32 C. 12 D. 20 E. impossible to say without additional information. become(s) 76. When the opportunity cost of lost revenue is relatively high, relatively more attractive. A. Layoffs B. Backorders C. Excess capacity D. Disaggregation E. Both B and C