Compute and compare the following projects NPVs $($net present value$)$ and EAAs $($equivalent annual annuity$)$ at a $12\%$ interest

a$.$ Project A costs $$120,000$ and earns $$80,000$ each year for five years.

b$.$ Project B costs $$160,000$ and earns $$100,000$ in the first year and then $$90,000$ for each of the next three years.

c$.$ Project C costs $$30,000$ and earns $$24,000$ for each year for two years.