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

Algebra ->  Customizable Word Problem Solvers  -> Misc -> 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      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

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) About Me  (Show Source):
You can put this solution on YOUR website!
Let s = sales 3 years ago
After 1st year:
s+-+.07s+=+.93s
After 2nd year:
.93s+-+.07%2A.93s+
.93s+-+.0651s+=+.865s
After 3rd year:
.865s+-+.07%2A.865s
.865s+-+.061s
.804s
Cassette sales decreased by
s+-+.804s+=+.196s
(E) 19.6%