Mathematics for IGCSE & O level - Percentages (Section 1 - No. 22)
What is the result of increasing a number by 10% and then decreasing it by 10%?
The number is unchanged
The number increases
The number decreases
The number doubles
คำอธิบาย
Decreasing the number by 10% after increasing it by 10% yields a number less than the original.