The choices are; 
a.57,000
b.60,000
c.75,000
d.63,000
Question
How many units must Burlington produce
Given
12000 units on hand
60,000 units expected production for the year
15,000 units more for the year
Solution
N=is the number of units that Burlington has to produce. Subtract the already made units from the expected Burlington units for the year then add the additional units to be produced. 
N = (6000-12000) +15000
N =  48000+15000
N=  63000 Answer