SOLUTION: Daniel wants to save at least 20 dollars by putting pennies in a jar each day. On the first day he puts one penny into the jar. The second day he puts 2 pennies into the same jar.

Question 883982: Daniel wants to save at least 20 dollars by putting pennies in a jar each day. On the first day he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he puts n pennies into the same jar. Which day is the first day on which he has at least 20 dollars in the jar? (1 dollar=100 pennies)
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
S=t*(1 - r^n)/(1 - r)
2000=1*(1 - 2^n)/(1 - 2)
n = 10.967
on the 11 day

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