help please help!!!

Amy, a senior, bought a car last year so that she could drive to school on the days when she needed to stay after class for practice. She spent $155 last year for gas. This year she spent $195. Disregarding other factors, what is the inflation rate?

Jim opened an account with $400. The account pays three percent quarterly. How much is in the account at the end of two years?

On her last credit card bill, Linda paid a variable rate of 1.8 percent on the first $200 and 1.2 percent on any amount over $200. How much did she pay if her unpaid balance was $256?

On his last credit card bill, Frank paid a variable finance rate of 1.5 percent on the first $500, and one percent on any amount above $500. How much did he pay if the unpaid balance was $741.23?

Alex bought a new easy chair for $399. She bought it on the "12 months is the same as cash" plan. The contract stated that if not paid in 12 months, she would be assessed 14 percent APR, dated from the first day of sale. If she pays it off on the thirteen...