What percentage of 90 is 18?

A common type of percentage calculation is to find the percentage of a quantity.  This is useful if you see a sign saying ‘15% off’, as you can work out the saving you will make.   The same technique can be used for increases – if you get a 5% salary rise, you can work out how much extra will be in your pay envelope. In a sale, remember to subtract the discount amount from the original price to work out how much you still have to pay. Another type of percentage calculation is percentage change, which occurs when something increases or decreases in value.  Work out what the actual change in... Show more

A common type of percentage calculation is to find the percentage of a quantity.  This is useful if you see a sign saying ‘15% off’, as you can work out the saving you will make.   The same technique can be used for increases – if you get a 5% salary rise, you can work out how much extra will be in your pay envelope.
In a sale, remember to subtract the discount amount from the original price to work out how much you still have to pay.
Another type of percentage calculation is percentage change, which occurs when something increases or decreases in value.  Work out what the actual change in value is, then divide it by the ORIGINAL amount before multiplying the result by 100.

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