What is the estimated annual sales in cans of soda?

What is the contribution margin per can of soda? $($rounded to two places, $#$.$##$)$

Annual incremental cash inflows from the soda machine? $($rounded to two places, $#$.$##$)$

What is the payback period in years? $($rounded to two places, #$.$## years$)$

If the time value of money is $12\%$ per year what is the net present value? Use the tables on page $18.$

What is the internal rate of return. Pick the closest interest rate from the tables on page $18.$