Question 60

A student multiplied a number by 6/13 instead of 13/6. What is the percentage error in the calculation?

Solution

Let the number be 78

When the student multiplied it by 6/13, => original result = $$\frac{6}{13} \times 78 = 36$$

When the student multiply it by 13/6, => New result = $$\frac{13}{6} \times 78 = 169$$

=> Percentage error in calculation = $$\frac{(169 - 36)}{169} \times 100$$

= $$\frac{13300}{169} = 78.69 \approx 78.7\%$$

=> Ans - (D)

Share on Whatsapp Share on Whatsapp

Create a FREE account and get: