Solving Inequalities?

Question

17.) If you invest $2000 at a rate of 8% per year, how many years will it take to earn at least $1000 in interest?
A.) 9 years
B.) 5.5 years
C.) 6 years
D.) 1year
E.) 3.75 years
F.) 6.25 years

20. What is the least amount of principal you can invest at an 8% interest rat to earn at least $1000 in interest in 3 years? (Round your answer to the nearest dollar.)
A.) $240
B.) $5167
C.) $20000
D.) $4167
E.) $6367
F.) cannot be determined

I am completely and utterly lost in these two problems can someone please show me how to do them or something?

Sincerely,
Ms. Peanut Butter

Answer 1

17)
Solve for n
$2000 *8% * n >=$1000

18)
Solve for A
A* 8%*3>=$1000