21/70 = 30%
A value like 30% can show up in everyday life as a discount, a test score, or the amount of a drink that’s left in a bottle. For example, a 30% discount means you pay less than the original price.
To picture 30%, imagine 10 equal pieces and shade 3 of them. It’s also a little less than one-third, which makes it easy to estimate at a glance.
A common mix-up is treating 30% as the same as 30 percentage points. A change from 20% to 30% is an increase of 10 percentage points, but it’s a 50% increase relative to the starting value.
