I HAVE THE ANSWERS BUT DONT KNOW HOW TO CALCULATE ON MY OWN.. CAN YOU PLEASE EXPLAIN?

Seasonal Products Corporation expects the following monthly sales January $20,000 July February March April May June Total sales $168,000 $10,000 14,000 20,000 25,000 30,000 22,000 15,000 August 5,000 September 3,000 October 1,000 November 3,000 December Sales are 20 percent for cash in a given month, with the remainder going into accounts receivable. All 80 percent of the credit sales are collected in the month following the sale. Seasonal Products sells all of its goods for $2.00 each and produces them for $1.00 each. Seasonal Products uses level production, and average monthly production is equal to annual production divided by 12 a. Generate a monthly production and inventory schedule in units. Beginning inventory in January is 5,000 units. (Note: To do part a, you should work in terms of units of production and units of sales.)