Expert: Richard J. Raridon - 10/26/2006

Question
so 5% is 1.05, 10% is 2.10, 15% is what? and 20% is 2.20
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The text above is a follow-up to ...

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so 20% is 2.05, 15% is 3.05 and 20% is 4.05?  I know this is elementary, but due to a recent stroke, i am finding things i did not do routinely, hard to remember and grasp.I need it a little clearer than twice as much oe 3 times as much.  Thanks in advance for your help.----
The text above is a follow-up to
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if 5% is 1.05, what is 20%,15%, and 10%?  Thanks
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10% is twice as much
15% is three times as much
20% is four times as much
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Twice 1.05 is 2.10
Three times 1.05 is 3.15
Four times 1.05 is 4.20

Answer
I just realized that there are two ways to look at what you were asking.  1.05 is 5% of 21 so 2.10 is 10% of 21, etc.  
However, if you're talking about a markup, for example, or a tax rate, then a 5% markup on $1.00 is $1.05, a 10% markup is $1.10, etc.