In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: if x ^ 2 + y ^ 2 = 15 and xy = 3 , then ( x − y ) ^ 2 = 
Options: a ) 8 , b ) 9 , c ) 14 , d ) 17 , e ) 20
[EX A]: b

[EX Q]: Problem: a company produces on an average 4000 items per month for the first 3 months . how many items it must produce on an average per month over the next 9 months , to average of 4375 items per month over the whole ? 
Options: a ) 4500 , b ) 4600 , c ) 4680 , d ) 4710 , e ) none
[EX A]: a

[EX Q]: Problem: a certain company had a total annual expenditure of 1.26 ∗ 10 ^ 7 on employee salaries last year . if the company employed 420 people , what was the average employee salary ? 
Options: a ) $ 20,000 , b ) $ 25,000 , c ) $ 35,000 , d ) $ 30,000 , e ) $ 45,000
[EX A]:
d