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JAMB Economics 2022 Paper

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Question : 47

Total: 82

In a pie chart, the population of a city is represented by 45. If the country has a population of 10 million people, then the city's population is?

0.0045 million
4.5 million
1.25 million
16 million

Solution:

Concept:

A pie chart uses angles out of

360^\circ

to represent proportions.

Explanation:

The city is represented by an angle of

45^\circ

.

Total angle of the pie chart is

360^\circ

.

Therefore, the fraction for the city is

\frac{45}{360}

.

Multiply this fraction by the total population:

\frac{45}{360} \times 10{,}000{,}000 = 1{,}250{,}000

Since

1{,}250{,}000 = 1.25

million, the city’s population is

1.25

million.

Answer:

C.

1.25

million

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