Topics in arithmetic

10

Contents:

A Percentage [1.8]

B Profit and loss [1.8]

C Simple interest [1.8]

D Reverse percentage problems [1.8]

E Multipliers and chain percentage [1.8]

F Compound growth [1.8]

G Speed, distance and time [1.13]

H Travel graphs [1.13]

Opening problem

#endboxedheading

80%of the profits from a cake stall will be given to charity.

The ingredients for the cakes cost$ 100 , and the total value

of the cakes sold was$ 275.

² How much profit did the cake stall make?

² How much will be given to charity?

You should have seen percentages in previous years, and in particular that:

² x% means

x

100

.

² x% of a quantity is

x

100

£the quantity.

A PERCENTAGE [1.8]

IGCSE01

cyan magenta yellow black

(^05255075950525507595)
100 100
(^05255075950525507595)
100 100
Y:\HAESE\IGCSE01\IG01_10\209IGCSE01_10.CDR Wednesday, 24 September 2008 4:44:43 PM PETER