Jane would like to borrow $850 for exactly one year, so that she can buy a brand-new lawn mower for the lawn-mowing business she is starting. jane's local bank agrees to lend her the money only if she is willing to pay back the full amount plus an extra $30, for a total repayment amount of $880. what is the annual interest rate on jane's loan from her bank? give the answer as a percentage, rounded to one decimal place.