pls share excel calculations

Question 4: 8 Marks A new excavator worth $10,000 can replace an existing excavator and provide annual savings of $3000 for five years. The old excavator can be sold for $500 The new, as well as old excavator, are eligible for tax depreciation at 20% per annum of the current value over the next 5 years. Assuming a cost of capital at 8% and a tax rate of 30%, what is the project NPV