Well, darling, four fifths of 100 is 80. It's like asking how many slices of cheesecake you can have when you're on a diet - you can only have four out of the five slices, so you're left with 80% of the deliciousness. Just remember, math doesn't lie, but your cravings might!
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Multiply by 100 and then divide by 5.
Four fifths.
4/5 = 0.8 as a decimal then multiply it by 100 = 80% as a percentage
Four fifths is less.
Four fifths.