Hi$!$ Can I get help solving this, preferably with excel so I can figure out how to fill in the table? See images for reference.

Margaret Daniels has the opportunity to invest $$670,000$ in a new venture. The projected cash flows from the venture are as follows. Use Appendix A and Appendix B$.($which are the charts showing PV of $$1$ and PV Annuity of $$1)$

$$Year $0$ Year $1$ Year $2$ Year $3$ Year $4$

Initial investment$ $(670,000)$

Taxable revenue$$ $ $82,500$ $ $77,500$ $ $67,500$ $ $62,500$

Deductible expenses $(17,700)(17,700)(14,900)(14,900)$

Return of investment$670,000$

Before$-$tax net cash flow$ $(670,000)$ $ $64,800$ $ $59,800$ $ $52,600$ $ $717,600$

Margaret uses a $7$ percent discount rate.

Required:

a$1.$ Complete the table below to calculate NPV$.$ Assume$$Margaret$\text{'}$s marginal tax rate over the life of the investment is $15$ percent.

a$2.$ Should$$Margaret make the investment?

b$1.$ Complete the table below to calculate NPV$.$ Assume$$Margaret$\text{'}$s marginal tax rate over the life of the investment is $20$ percent.

b$2.$ Should Margaret make the investment?

c$1.$ Complete the table below to calculate NPV$.$ Assume$$Margaret$\text{'}$s marginal tax rate in years $1$ and $2$ is $10$ percent and in years $3$ and $4$ is $25$ percent.

c$2.$ Should Margaret make the investment?