Please help! Will give brainliest if you do both. Only 9 and 12

Answer:
Answers below
Step-by-step explanation:
9a. Meg needs to find the Part because she knows the whole is 16 and the percent is 50%
9b. Steve needs to find the percent because he knows the part is 7 and the whole is 35.
12. Find 4% of 40 for the sales tax
0.04*40=1.6
Therefore the sales tax is $1.6