need help with these two please

Suppose you invest $1,500 in an asset that has a rate of return of 7.75%. How long will it take your investment to triple if interest is paid quarterly? O 57.25 years 14.72 years 14.31 years O 3.68 years Due to the decrepit state of your 18-speed bicycle and the resulting derisive comments from random bystanders, you have opted to purchase new transportation. The local bike shop is offering a promotional sale in which you pay $1000 now and the remainder of the bike's price, i.e., $500, is due 5 years from now, while you pedal away today on one of the shop's firfest Scorpian bikes. If you are able to earn 6% interest annually by loaning money to a friend, how much money would you need to invest today in order to have $500 in 5 years, assuming annual compounding, and pay off the bike? $669.11 0 $373.63 $391.76 $638.14