Please, show the solution. Thank you in advance!

Prada has ten million shares outstanding, generates free cash flows of $ 50 million each year and has a cost of capital of 10%. It also has $50 million of cash on hand. Prada wants to decide whether to repurchase stock or invest the cash in a project that generates free cash flows of $5 million each year. Should Prada invest or repurchase the shares?

a) invest b) repurchase c) cannot say for sure d) indifferent between options