Answer:
21.6%
Step-by-step explanation:
Divide the previous bill by the current bill to find what percentage the current bill is of the previous bill
98/125 = 0.784
Subtract the decimal from 1 to change it from what the percentage is of the previous bill to how much the bill decreased by
1 - 0.784 = 0.216
Multiply by 100 to change the decimal into a percentage
0.216 × 100 = 21.6
21.6%