Machines that have the following costs are under consideration for a new manufacturing process. Compute the Equivalent Annual Worth with an interest rate of $8\%,$ compounded semiannually. The machine last $4$ years.

First cost: $$40,000$

Semiannual operating cost: $$8,970$

Semiannual incomes: $$14,000$

Salvage value : $$10,000$

a$.$ EAW$=$$$2,285$

b$.$ EAW$=$$$175$

c$.$ EAW$=$$$1,958$

d$.$ EAW$=$$$21,745$