Answer: at new cost increase is 30%
after additional $4.50 fee increase would be 45%
Step-by-step explanation:
use equation
30:100=39:x
30x=3900
x=3900/30
x=130
130-100=30%
39+4.50=43.5
30:100=43.5:x
30x=4350
x=4350/30
x=145
145-100=45%
Answer: 7
Step-by-step explanation: