Answers

2014-09-29T16:01:17+08:00
2014-09-29T18:43:38+08:00
To get percentage: Multiply the base and the rate
To get the rate: Divide the base to the percentage (ex. 18[percentage] ÷ 90[base])
To get the base: Divide the percentage to the rate (ex. 18[percentage] ÷ 20[rate])
so the answer in your problem is 16% or 17% :D
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