Mathematics for IGCSE & O level - Percentages (Section 5 - No. 27)
An item originally costs $100 and is discounted by 20%. Then, the discounted price is further discounted by 10%. What is the final price?
$70
$72
$79.20
$80
解释
100 * 0.8 = 80, 80 * 0.9 = 72