help with part b please

Consider the financial data for a project given in the table below. $80,000 6 years $13,000 Initial investment Project life Salvage value Annual revenue $28,000 $8,000 Annual expenses for this project? a) What is 15.6 % (Round to one decimal place) (b) If the annual expense increases at a 7% rate over the previous year's expenses, but the annual income is unchanged, what is the new ? % (Round to one decimal place.)