Calculate the fixed swap rate for a plain vanilla interest rate swap with payments every 60 days for 300 days if the underlying spot rates are the following:

60-day: 8 %

120-day: 8.5 %

180-day: 8.5 %

240-day: 7.7 %

300-day: 7.84 %

Provide your answer in percent, rounded to two decimals, omitting the % sign.