explanation please!!

6. This year Jill has enough money to buy 52 twelve-packs of Diet Pepsi at $7 a pack. If the cost of Diet Pepsi is expected to increase by 3%, what approximate nominal rate would Jill have to earn to be able to buy 55 twelve-packs next year? [ 8.77\% ] 7. You have $425 today which is enough to buy 17 shirts. If the price of shirts is expected to increase by 2% over the next year, what approximate nominal rate would you have to earn to be able to buy 20 shirts next year? []