Mathematics of Investement and Credit

Joe deposits 10 today and another 30 in five years into a fund paying simple interest of 11% per year .

Tina will make the same two deposits, but the 10 will be deposited nyears from today and the 30 will be deposited 2n years from today.

Tina's deposits earn an effective annual rate of 9.15%.At the end of 10 years the accumulated amount of Tina's deposits equals the accumulated amountof Joe's deposit equals the accumulated amount of Joe's deposits. Calculate n