A business intends to use 90-day bank-accepted bill futures to hedge the interest rate risk resulting from its plans to borrow approximately $5 million using the issue of commercial paper in three months. The yield on commercial paper is currently 6.25% p.a. and the 90-day bank-accepted bill futures are currently priced at 95.55. The effective cost of funds if, in three months time the yield on commercial paper is 7.2%p.a. and the 90-day bank-accepted bill futures contract is priced at 94.35, is ____ % p.a. (rounded to two decimal places)

The answer is 5.99%

please write clearly and write formula that i can follow step by step.