Mathematics for IGCSE & O level - Percentages (Section 2 - No. 39)
Which expression correctly calculates the sale price after a 15% discount on an item originally priced at P?
P + 0.15
P - 0.15
P * 0.15
P * 0.85
説明
A 15% discount means the sale price is 85% (100% - 15%) of the original price, hence P * 0.85.