Question

Whta is 40% of 50?

Answer 1

20

Explanation:

There are two ways of writing percentage and they both mean EXACTLY THE SAME THING.

Method 1 `40%`

Method 2 `40/100`

Note that `40/100` is the same thing as `40xx1/100`

The fraction format is special in that the bottom number is always fixed at 100. So, if these mean 'exactly' the same thing we have:

`40color(white)("ddd")%`
`40 color(white)("d")obrace(xx1/100)`

So the % symbol means `xx1/100` including the multiply sign.
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In mathematics the word 'of' usually means multiply.

So we have: `color(white)("d")40%color(white)("d")" of "color(white)("d")50`

`color(white)("ddddddddd.")40/100color(white)("ddd")xxcolor(white)("dd")50`

`40/100xx50`

`40xx50/100 larr" you are allowed to move the 100 like this"`

`40xx1/2=20`

Answer 2

`20`

Explanation:

`40%` of `50` is,

`40/100 * 50 = 20`

Another way is by decimals.

`0.4 * 50 = 20`

A trick that you could use:

`40 %` of `50` means

`40 * 50` which is `2000` and obviously it needs to be lower than `50` because of the `40 %` so you remove the two zeros and get `20`.