The nominal interest rate is 5.9 % and the tax rate is 28 %. What is the real interest rate if you account for tax, given that the inflation is 2.6 %? (Answers are rounded to one decimal)

a) The real interest rate after tax is 4.2%

b) The real interest rate after tax is 4.1%

c) The real interest rate after tax is -3.8%

d) The real interest rate after tax is 1.6%