I was late paying a bill and the total has gone from $124.85 to $136.17 I would like to know how to calculate the increase as a percentage. Thanks in advance
2026-03-28 14:07:45.1774706865
calculating a penalty as a percentage
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$$\frac{136.17-124.85}{124.85} \cdot 100\% \doteq 9\% $$