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: 5.4 %

120-day: 5.2 %

180-day: 4.8 %

240-day: 5.68 %

300-day: 5.12 %

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