If a movie ticket now averages $6.75 and has been increasing an average of 15% per year compute the cost:
in 8 years
8 years ago
C=present cost
C*1.15=cost for next year
C*1.15²=cost in two years
C*1.15³=cost in three years
....
C/1.15=cost of ticket last year
C/1.15²=cost of ticket two years ago
....
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