Problem $7$

Five separate projects have calculated rates of return of $8,11,12\mathrm{.}4,14,$ and $19\%$ per

year. An engineer wants to know which projects to accept on the basis of rate of

return. She learns from the finance department that company funds, which have a

cost of capital of $18\%$ per year, are commonly used to fund $25\%$ of all capital

projects. Later, she is told that borrowed money is currently costing $10\%$ per year. If

the MARR is established at exactly the weighted average cost of capital, which

projects should she accept?

I need solution with details

Engineering economi