Answer:
80
Step-by-step explanation:
You plug in 1200 for x.
C(1200)=0.05(1200) +20
Then solve. Multiply first then add.
60+20
I think it would be the bottom left angle, x + 20 = 20x.
Why the others are smaller:
10x (x + 10)
12x (2x + 10)
Commutative Property of Multiplication.
-4