Answer:
10-First you have to do 13,500x4 to get 54,000. Then do 400x3 to get 1,200. then do 54,000+1,200 to get a total of $55,200 for a total of 4 years.
11-
d. First you have to find what is 16% of 42,000 and i got 6,720. Then you add 42,000+ 6,720 to get 48,720. so your answer would be $48,720.
e.Then you do the same steps here but instead of 16% you have a 20% bonus, which you'd get 8,400. Then you add 42,000+8,400 to get a total of $50,400 as your answer.
I hope that this helps you. lmk if you need anything else,