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Suppose the nominal interest rate is 6%, the tax rate on interest income is 30%, and expected inflation is 3%. (a) Calculate the expected after-tax real interest rate. (b) Calculate the expected after-tax real interest rate if the nominal interest rate falls to 4%. (c) Calculate the expected after-tax real interest rate if the tax rate increases to 50% (with the nominal interest rate at its original value of 6%). (d) Calculate the expected after-tax real interest rate if expected inflation increases to 5% (with the nominal interest rate at its original value of 6% and the tax rate at its original value of 30%).