6.25
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the formula for finding percentage decrease would be:
[(start value - final value)/start value] · 100.
in this case, it would be 5/80 · 100.
5 ÷ 80= 0.0625 · 100= 6.25%.
sorry if this doesnt make sense, but hopefully you understand it !! (i also attacted scrap paper just in case)