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For example, a 10% decrease is equivalent to multiplying the original number by the factor 0.9. This is equal to (100-10)/100. In general, reducing something by a factor of "x" percent is equivalent to multiplying by a factor of (100-x)/100. Note that with some practice, you should be able to do all the calculations in your head, at least for a whole-number percentage.For an increase, change the minus to a plus - that's all.
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What is the answer to a 30 percent decrease of 186?
First you need to know what 30% of 186 is. This can be found by multiplying: 0.3 x 186 = 55.8 Then you subtract that number from 186 to find the answer: 186 - 55.8 = 130.2
How do you find a percent if the whole number is know?
a as a percentage of b = 100a/b
Write a proportion that can be used to find the part if you know the base and the percent. Then solve the proportion.?
Part = Base*Percent/100Proportion = Part/Base = (Base*Percent/100)*Base = Percent/100.
How would you find the price of a discounted item if you only know the percent of the discount?
You could not. You need to know the pre-discount price as well.
How do you find the original price of an item if you know the sales tax percent and amount?
The amount of tax divided by the percent of tax (expressed as a decimal) will equal the original price.
