A customer’s monthly water bill was $75.74. Due to a rate increase, her monthly bill is now $79.86. To the

Question

A customer&rsquo;s monthly water bill was $75.74. Due to a rate increase, her monthly bill is now $79.86. To the nearest tenth of a percent, by what percent did the amount of the customer&rsquo;s water bill increase?

Accepted Answer

Choice D is correct. To find the percent increase of the customer&rsquo;s water bill, the absolute increase of the bill, in dollars, is divided by the original amount of the bill, and the result is multiplied by 100%, as follows: ; . Choice A is incorrect. This choice is the difference rounded to the nearest tenth, which is the (absolute) increase of the bill&rsquo;s amount, not its percent increase. Choice B is incorrect and may be the result of some calculation errors. Choice C is incorrect and is the result of dividing the difference between the two bill amounts by the new bill amount instead of the original bill amount.

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