Question

A store had 235 MP3 players in the month of January. Every month, 30% of the MP3 players were sold and 50 new MP3 players were stocked in the store.
Which recursive function best represents the number of MP3 players in the store f(n) after n months?

A. f(n) = 0.7 × f(n − 1) + 50, f(0) = 235, n > 0
B. f(n) = 237 − 0.7 × f(n − 1) + 50, f(0) = 235, n > 0
C. f(n) = 0.3 × f(n − 1) + 50, f(0) = 235, n > 0
D. f(n) = 237 + 0.7 × f(n − 1) + 50, f(0) = 235, n > 0

Answer 1

f(n) = 0.7(n-1) + 50, f(0) = 235, n>0, showing 30% sold and 50 added