A student multiplied a number by 5/8 instead of 8/5. What is the percentage error in the calculation?
Let the number be 40
When the student multiplied it by 5/8, => original result = $$\frac{5}{8} \times 40 = 25$$
When the student multiply it by 8/5, => New result = $$\frac{8}{5} \times 40 = 64$$
=> Percentage error in calculation = $$\frac{(64 - 25)}{64} \times 100$$
= $$\frac{3900}{64} = 60.937 \approx 60.94\%$$
=> Ans - (A)
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