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# The usage of sugar of a family of 3 adults and 2 children was 13 kg in

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Re: The usage of sugar of a family of 3 adults and 2 children was 13 kg in [#permalink]
Hi All,

We're told that the usage of sugar of a family of 3 adults and 2 children was 13 kg in a certain month and the monthly AVERAGE usage of sugar for an adult is 3 kg and for a child is 1 kg. We're asked by what percent THIS specific month’s sugar consumption was more or less than the typical usage. The wording of this question is a little 'clunky', but the intent is to test us on the Percentage Change Formula:

Percent Change = (New - Old)/(Old) = Difference/Original

With 3 adults and 2 children, the AVERAGE monthly usage would give us a total of (3)(3) + (2)(1) = 11 kg of sugar.
This month, the total is 13 kg though, which is clearly an INCREASE.
The percent change is (13 - 11)/11 = 2/11 = a little more than 18%