Frank borrowed money from his older sister. They agreed to terms where Frank would pay off 9% of the remaining balance every month. How long will it take for Frank to reduce the balance to 1/2 of the original amount? Use the rule of 70 and round to the nearest month.

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The Answer of Frank borrowed money from his older sister. They agreed to terms where Frank would pay off 9% of the remaining balance every month. How long will it take for Frank to reduce the balance to 1/2 of the original amount? Use the rule of 70 and round to the nearest month.

Frank Borrowed Money from His Older Sister