7th grade math only 2 questions Ms, Sue please
posted by Delilah .
Tom buys a shirt for $22.00 plus 7% sales tax. His cousin buys a shirt for $18.00 plus 4% sales tax.
a. How much do Tom and his cousin pay for the shirts? Show your work.
b. Who spent more on tax? (3 points)
18.
In 2000, the circulation of a local newspaper was 3,250. In 2001, its circulation was 3,640. In 2002, the circulation was 4,100.
a. Find the percent of increase in the newspaperâ€™s circulation from 2000 to 2001 and from 2001 to 2002.
b. Which period had a higher percent of increase, 2000 to 2001, or 2001 to 2002? (3 points)
I need help solving these problems. I need to show my work, but I don't really know the steps to solve these problems. Thanks so much.

first: pay=(1.07)*22 + (1.07)18
The more you pay, the more tax you paid. 
17) .07 times 22.00 will give you the amount of tax on the shirt
That should get you going
18) difference / start
2000 to 2001. Would be (36403250)/3250 or 12%
That should get you going 
Thanks everybody for your help! I really understand 17 now! .............Not so much 18, but thanks anyway!