Student: A certain debt will be paid in 52 installments from January 1 to December 31 of a certain year. Each of the first 25 payments is to be $500; each of the remaining payments is to be $100 more than each of the first 25 payments. What is the average (arithmetic mean) payment that will be made on the debt for the year?
Options:
(A) 500
(B) 450
(C) 552
(D) 600
(E) 400.
Another student: Let's say, hmmm...
Total = 500(25) + 600(27)
Number of installments = 52
Average = Total/Number of installments = 552 approximately Final answer: (C).