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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