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BECE Mathematics 2010 Paper

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Question : 7

Total: 40

Find the total cost of 25 pens and 75 books if each pen costs GH₵ 0.20 and each book costs GH₵ 0.30.

GH₵ 22.50
GH₵ 23.50
GH₵ 27.50
GH₵ 50.00

Solution:

\; \text{ Total costs } \; = 25 \times \; \text{ GH₵ } \; 0.20 + 75 \times \; \text{ GH₵ } \; 0.30

Note: The zeros at the end of a decimal number are ignored.

\;0.20,0.200,0.2000=0.2

\;0.30,0.300,0.3000=0.3

\;0.2=\;\frac{2}{10}

\;0.3=\;\frac{3}{10}

Total costs

=25 \times \; \frac{ \text{GH₵} 2 }{10} + 75 \times \; \frac{ \text{GH₵} 3 }{10}

Total costs

=\; \frac{ 25 \times \text{GH₵} 2 + 75 \times \text{GH₵} 4 3 }{10}

Total costs

=\; \frac{ \;\text{ GH₵ 50 + GH₵ 225 }\; }{10}

Total costs

=\; \frac{ \;\text{ GH₵ }\; 275 }{10}

Total costs

=

GH₵ 27.5

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