Can someone please help me with this question, Please do not use excel

6 Tom Ward put $10,000 in a 5-year certificate of deposit that pays 3.5% interest per year. At maturity he will receive his $10,000 back. Tom's marginal income tax rate is 24%. If the inflation rate is 2% per year, find his (a) before-tax rate of return, ignoring inflation (b) after-tax rate of return, ignoring inflation (c) after-tax rate of return, after taking inflation into account