payback period

parkes book companys management is considiering an advertising program that would require an initial expenditure of $ 165 000 and bring in additional sales over the net five years. the profected additional sales revenue in year 1 is $75 000 with associated expenses of $ 25 000 the additional sales revenue and expenses forom the advertising program are projected to increases by 10 per cent each year. ignore company income taxes

1. calcualte the payback period for the advertising program

2. calcualte theh advertising programs net present value assuming a required rate of returen of 8 percents

plz provid detail explanation of both questions