help with instructions pls

You have been offered two jobs. One is commission based, the other is a fixed salary of $120,000, with a minimal annual increase of 5%. You have been told that the commissions should average the following over the next 5 years. With inflation, the opportunity cost is about 15%. Which job has the best present value? Hint: Calculate the NPV of each series of cash flow The Salaried Position The Commission Position