Answer:
15%
Step-by-step explanation:
set up 15/20= x/100
cross multiply to solve for x
1500=20x
x= 75
15 dollars is 75% of the original price, so there was a 15% change
Common difference = -16-(-20) = 4
nth term = -20+(n-1)4
8000-2600=5400
5400/12=450
monthly pavement =450
12x450+2600=8000
You need to d to one side of the equation by itself and them use PEMDAS to solve your answer