A firm has 200 units of a product in inventory. The forecasts of the demands are 40 units per week. An MPS quantity of 50 units is planned to arrive in period 2. Customer orders are 40 for period 1, 10 for period 2, and 50 for period 3. Present the computation to estimate the projected on-hand inventory at the end of period 3, and the result (for example, 500-400+10=110 units.)