George bought a car at $5000 and sold it at $5500. What benefit, in percent, did he make?
a. 500%
b. 10%
C. 5000%
0.5%

Really need on these. i have no idea what to do

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?