Answer:
the question is incomplete:
nominal interest rate = 5.07%
real interest rate = ?
inflation rate = 3.45%
approximate real interest rate = 5.07% - 3.45% = 1.62%
real interest rate = [(1 + 5.07%) / (1 + 3.45%)] - 1
real interest rate = (1.0507/1.0345) - 1 = 1.57%