need help on this one will give review! thanks for your time

You have the opportunity to purchase a mortgage from a lender. The mortgage will pay you $2100 monthly for 88 months. Given that the lender is offering to sell you this mortgage for $175,000, what is the effective annual yield if you purchase the mortgage at this price? [Please give your answer in percent to two decimal places. Thus if the answer you find is +15.89453% please write simply 15.89]