I have issues with ATP

Shown below is a partially completed MPS record for ball bearings. 9 8 350 10 400 450 50 50 100 a. Develop the MPS for ball bearings. (Enter your responses as integers. A response of "O" is equivalent to being not applicable.) Item: Ball bearings Order Policy: 500 units Lead Time: 1 week Quantity Week on Hand: 400 1 2 3 4 5 6 7 Forecast 550 250 350 400 250 400 250 Customer orders 300 350 250 250 150 150 100 (booked) Projected on-hand 350 0 150 250 0 100 350 inventory MPS quantity 500 0 500 500 0 500 500 MPS start 0 500 500 0 500 500 0 Available-to- promise (ATP) 0 100 0 inventory 0 50 150 0 500 500 500 500 0 0 400