Mathematics for IGCSE & O level - Percentages (Section 5 - No. 6)
Which of the following statements are key points for calculating percentages?
A percentage is equivalent to a fraction with the percentage as the numerator and 100 as the denominator.
To find a quantity after a percentage increase, subtract the percentage from 100% and use the equivalent decimal as a multiplier.
To find one quantity as a percentage of another, write a fraction with the first quantity as numerator and the second as denominator, then multiply by 100.
Simple interest is added to the original investment.
Explicación
Only the first and third options are correct. The second is for percentage decrease, and the fourth describes compound interest.