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WAEC Mathematics 2024 Paper

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Question : 10

Total: 50

A trader gave a change of # 540.00 instead of # 570.00 to a customer. Caculate the percentage error.

5 $\frac{5}{19}$ %
5 $\frac{5}{9}$ %
5 $\frac{7}{19}$ %
5 $\frac{7}{9}$ %

Solution:

% error = $\frac{\text{Error}}{\text{Actual value}}$ x 100%

Error = #570 - #540 = #30

% error = $\frac{30}{570}$ x 100%

= $\frac{100}{19}$ % = 5 $\frac{5}{19}$ %

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