You purchase lunch at a fast food place every day forever. Lunch costs on average $10.21 per day. Normal investments make 4.01% per year compounded semi-annually.

a) What daily interest rate is equivalent to 4.01% per year compounded semi-annually?

the answer is 3.97 %, show me the steps

b) What one time payment today should you pay for lunch (forever - including today).

the answer is: $ 93867.60, show me the steps