Monica is the CFO of Cooking for Friends$($CFF$)$ and uses the pecking order hypothesis philosophy when she raises capital for company projects. $$ Currently, she can borrow up to $$$$400000$ from her bank at a rate of $7\mathrm{.}5\%,$ float a bond for $$$$700000$ at a rate of $10\%,$ or issue additional stock for $$$$1300000$ at a cost of $18\%.$ What is the WACC for CFF if Monica chooses to invest

a$.$$$800000$ in new$$ projects?

b$.$$$2200000$ in new$$ projects?

c$.$$$2400000$ in new$$ projects?