Please write the formulas on how to find these answers, witout excel spread sheet

$2.$ Your firm has a project opportunity with the following cash flows: $-$$$1,200,000$ in Year $0,$ $$150,000$ in Year $1,$$$295,000$ in Year $2,$$$875,000$ in Year $3,$ and $$390,000$ in Year $4.$ Your firm's WACC is $12\%.$ What would be the IRR of the project?

A$)12\%$

B$)13\mathrm{.}32\%$

C$)15\mathrm{.}89\%$

D$)18\mathrm{.}60\%$

E$)$ There is not enough information to answer this question.

Please use the following information to answer the next TWO questions.

A new electronic process monitor costs $$7,000,000.$ This cost could be depreciated at $30\%$ per year $($CCA Class $10).$ The monitor could be sold for $$1,428,595$ at the end of five years. The new monitor would save the firm $$2,400,000$ before taxes in annual operating costs for the five years. There would be no impact on net working capital. The firm's weighted average cost of capital is $15\%$ and the corporate tax rate is $40\%.$

$3.$ What would be the NPV of purchasing this system?

A$)$ $$866,886$

B$)$ $$816,957$

C$)$ $$3,310,960$

D$)$ $$92,891$

E$)$ $$512,639$

$4.$ How would the NPV of purchasing the monitor change if we were to use a higher CCA rate $($for example, $40\%$ instead of $30\%)?$

A$)$ The NPV of purchasing the monitor would decrease.

B$)$ The NPV of purchasing the monitor would increase.

C$)$ The NPV of purchasing the monitor would not be affected.

D$)$ There is not enough information to answer this question.

E$)$ None of the above.