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

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I believe it is A) but I am not entirely sure, can someone walk me through the steps?

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