I have a pretty simple math problem: the price of a liter cola increased from $1.09 to $1.29. What was the percent of increase? I know to first subtract (1.29-1.09) that equals $.20. Next divide .20 by 1.09 (first move decimal points over) I got the same ander as the book, except it says the final answer is 18.3% increase. Where did the decimal come from? It's supposed to be in front of the 1. I think they're rounding, but how did the get that? And how are you supposed to round a non terminating, non repeating decimal(in finance)?

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@Learea Do you find this helps your understanding?

Thanks! Is that how numbers (with percents or money) is usually rounded? To the nearest one tenth?

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