a loan shark charges 81.5% APR. What is this as a percent per month?

well, how many months in a year?

12

so, divide the annual rate by 12 to get the monthly rate.

To find the percent per month, you should first divide the annual interest rate (APR) by 12 to get the monthly interest rate.

In this case, the loan shark charges 81.5% APR. Therefore, the monthly interest rate would be calculated as follows:

81.5% / 12 = 6.79%

So, the loan shark charges approximately 6.79% interest per month.