percentages

Pregunta	Respuesta
Percentages	A percentage is a fraction of 100. 30% (30 in each 100) as a fraction is 30/100 30% as a decimal is 0.3.
Work out 30% of £700	The word 'of' means multiply. 30/100x700=£210
Percentage increase and decrease	In some questions you are given the cost price and the selling prices and have to find the percentage increase or decrease. This means you need to find one amount as a percentage of another. %change=change/original x 100%
Ajay is dealing in electrical goods. He buys a radio for £45 and sells it for £63 . What is his percentage profit?	Here the cost price is £45 and the selling price is £63 . The profit is £63-£45 =£18 Next divide the profit by the original price and multiply by 100. 18/45 times 100 = 40%
Reverse percentages	Reverse percentage is when the original quantity is calculated
The price of a T.V is reduced by 20% in the sales.It now cost £250.What was the original price.	The sale price is 100%-20%=80% 80/100=0.8 £250/0.8=£312.50 For an increase in price add the % together instead and multiply
Compound interest	Here the interest is added to the principal at the end of each year. So the next year the interest is worked out on a larger amount of money than what was originally borrowed
If Jon has £2500 in his savings account and interest is paid at 4.4%, how much will he have in 3 years	1)104.4/100x£2500=£2610 2)1.044x£2610=£2724.84 3)1.044x£2724.84=£2844.73 Total=£2844.73 Or £2500x(1.044)3

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	Creado por Darcie Hughes hace más de 9 años