The sale price of an item that is discounted by 20% of its list price L
S = L - 20%/100 * L
S = L - 0.20L
S = 0.8L
S = L - 20%/100 * L
S = L - 0.20L
S = 0.8L
The sale price of an item that is discounted by 20% of its list price L
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