Skywards Inc., an airline caterer, is purchasing refrigerated trucks at a total cost of $$3\mathrm{.}25$ million. After$-$tax net income from this investment is expected to be $$750,000$ for the next five years. Annual depreciation expense was $$650,000.$ The company$$s cost of capital is $15$ percent.

Compute the discounted payback for this project?

Compute the NPV for this project?

Compute the IRR for this project?

Calculations are to be done in Excel, answer in that fomat with explanation would be helpful.