Mathematics for IGCSE & O level - Percentages (Section 6 - No. 43)
If an item increases in value by 10% one year and then decreases by 10% the next year, what is the final change as a percentage?
0%
10%
-1%
-10%
説明
If starting value is 100, a 10% increase gives 110. A 10% decrease from 110 gives 99. So the overall change is -1%.