macro to create rows of data based on divided quantities

I need a code that will take the amount I have on order for a certain day, divide it by the amount in a container and create a line item for each of the divisable amounts plus the remainder. For example: I have 250 (cell F21) on order for 11/28 (cell B21) and 100 qty per container (cell P3). The results should be

Column P Column Q
11/28 100
11/28 100
11/28 50

Thank you.