Solve clearly

Given the following data, use present worth analysis to find the better alternative, A or B. Use an analysis period of 12 years and 12% annual interest rate. A B Initial cost 9,451 15,471 Annual benefit 5,098 9,598 Salvage value 1,233 -2,122 Useful life 6 years 4 years What is the difference between the present worth of alternative B and A, specifically what is PWg - PWA? State your answer with 2 decimal places