Question 68

A student multiplied a number by 4/5 instead of 5/4. What is the percentage error in the calculation?

Solution

Let the number be 100

When the student multiplied it by 4/5, => original result = $$\frac{4}{5} \times 100 = 80$$

When the student multiply it by 5/4, => New result = $$\frac{5}{4} \times 100 = 125$$

=> Percentage error in calculation = $$\frac{(125 - 80)}{125} \times 100$$

= $$\frac{45}{5} \times 4 = 36\%$$

=> Ans - (D)

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