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Mark borrows $10$ dollars from Emily with a simple interest rate of $15\%$ everyday. What is the least integer number of days after which Mark will have to pay her back at least twice as much as he borrowed?

 Oct 8, 2017
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The simple interest for 1 day would be:

$10 x [15/100] =$1.50

$10 / $1.50 =6.66667days =~7 days in which Mark will have her back at least $20.

[7 x $1.50] + $10 =$20.50 This is what Mark will pay Emily back in 7 days.

 Oct 8, 2017

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