12/50 = 24%
A value like 24% can show up in everyday life when a store advertises a discount, a weather forecast gives the chance of rain, or a poll reports how many people chose an option. It describes a share of a whole, so the meaning depends on what the whole represents.
To picture it quickly, think of about one out of every four equal parts. That makes it a little less than a quarter, which is a handy estimate for comparing amounts.
One common mix-up is treating 24% as exactly one quarter. A quarter is 25%, so 24% is just a bit smaller, even though the two are close.