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Joaquin has agreed to lend his younger brother so that he can buy a new tank for his pet lizard. Joaquin is charging his brother simple interest per month. If his brother pays him back in months, how much will Joaquin get back?  

Calculate the interest Joaquin will earn for one month by calculating what of would be.
Once you know how much interest he will earn for one month, can you calculate how much he will earn for months?

Add the total interest earned to the original amount Joaquin lent his brother.