40/42 as a percentage is 95.24%. This fraction is very close to a whole, so its percentage is also close to 100 %.
When you simplify 40/42 you get 20/21, which still represents the same value. Seeing it as a percent makes it easier to compare with other numbers, especially in everyday situations like sales or test scores.
In practical terms, a result of 95.24% means you have achieved almost the full amount. It’s a useful way to communicate how much of something you have relative to the total.