McDuck Inc.'s bonds currently sell for $875. They pay a $80 annual coupon, have a 25-year maturity, and a $1.000 par value, but they can be called in 4 years at $1,100. Compute the Yield to Call (State as a percent, but do not include the percent sign and round to the second decimal place. Thus, 9.8765% would be written as 9.88 to be correct)