$$ Not using excel to solve plz just equations $!$

OpenSeas, Inc. is evaluating the purchase of a new cruise ship.

The ship will cost $$503$million$,$ and will operate for $20$ years.

OpenSeas expects annual cash flows from operating the ship to be

$$71\mathrm{.}6$ million and its cost of capital is $12\mathrm{.}1\%.$

OpenSeas, Inc. is evaluating the purchase of a new cruise ship. The ship will cost $$495$ million and will operate for $20$ years. OpenSeas expects annual cash flows from operating the ship to be $$68\mathrm{.}9$ million and its cost of capital is $11\mathrm{.}8\%.$

a$.$ Prepare an NPV profile of the purchase.

b$.$ Identify the IRR on the graph.

c$.$ Should OpenSeas go ahead with the purchase?

d$.$ How far off could OpenSeas's cost of capital estimate be before your purchase decision would change?