Answer:
It was changing 5/7 per hour.
Step-by-step explanation:
subtract 5/7 from the price each hour.
9 - 15
10 - 14.28
11 - 15.57
12 - 12.85
1 - 12.14
2 - 11.42
3 - 10.71
4 - 10
mark brainlest pls
