can someone help solve this using excel?

thank u

Eastern Engineering has the following base-case estimates for a new small engine assembly project:

Capital Investment = $15,000,000 Fixed Costs = $3,250,000 Variable Costs = $600 per unit Price per Unit = $1,000 Demand = 20,000 units per year Service Life = 12 years Salvage Value = $500,000 MARR = 20%

a)Find the net present worth, equivalent annual worth, and rate of return of this base-case scenario.

b)if the variable costs were to be 15% lower, how would it affect the net present worth, equivalent annual worth, and rate of return of the project? What if the variable costs were 15% higher?