10% of 5 is 1/2 and 5+1/2 = 5.5
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The percent of increase is 40%
The way I find percentages is: To find 17% I: Find 10 percent, Then half the 10 percent, to get 5 percent which makes 15%. Then find a 5th of the 5 % and double it to make 17%
To calculate a five percent increase, multiply the value by 1.05. For example, adding 5 perccent to £10.00 gives 10 x 1.05 = £10.50.
This is an increase of 10 percentage points or a 13.33% increase.