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Cambridge IGCSE 0580
Find percentages of amounts, increase and decrease by a percentage, and work backwards to the original.
Increase by .
Decrease by .
Increase by .
A jacket costs . In a sale the price is reduced by . Work out the sale price.
A camera costs . In a sale the price is reduced by . Work out the sale price.
Increase by .
Percentages of amounts, Standard
Use a multiplier: a 15% increase is multiplying by 1.15 and a 15% decrease is multiplying by 0.85. To find the original, divide by the multiplier.
Learn the method