SOLUTION: Sales of cassette tapes of music decreased by 7% per year for 3 years. The percent that best approximates the total percent that sales of cassette tapes of music decreased during t

Question 280080: Sales of cassette tapes of music decreased by 7% per year for 3 years. The percent that best approximates the total percent that sales of cassette tapes of music decreased during this time period is:
(A) 80.4% (B) 79% (C) 34.3% (D) 21% (E) 19.6%
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = sales 3 years ago
After 1st year:

After 2nd year:

After 3rd year:

Cassette sales decreased by

(E) 19.6%
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