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Question:

The cost of a protein bar increased from $2.50 to $2.80. The percent increase to the $2.80 rate was how much?

A 12%
explanation

First subtract the old cost from the new cost: $2.80 – $2.50 = $0.30. Then divide the difference by the old cost to find the percent difference: $0.30 ÷ $2.50 = 0.12 = 12%.