First, the amount that is needed in order to complete the 80,000 expected sales given that there is already 18,700 units is calculated by subtraction of 18700 from 80,000.
n = 80,000 - 18,700 = 61,300
If the company wishes to have 19,500 inventory at the end of the year, the total number of units to be produced is,
T = 61,300 + 19,500 = 80,800
Answer: 80,800 units