Question

A student multiplied a number by 8/5 instead of 5/8. What is the percentage error in the calculation?

Q: A student multiplied a number by 8/5 instead of 5/8. What is the percentage error in the calculation

Let the required number = (LCM of denominator 5 and 8) = 40 According to the question, Wrong answer = 8/5 × 40 = 64 Correct answer = 5/8 × 40 = 25 Required percentage of error = (64-25)/25 × 100 = 156%

A 127%

B 164%

C 156%

D 124%

E 146%

Download PDF Practice Next

More Percentage Questions

A gets 34% of the full marks in an exam and fails by 80 marks. B gets 36% of the full marks in the same exam and he also fails by 64 marks. What is the minimum percentage of marks a student should obtain to pass the exam?
A girl spent 40% of her monthly income on clothing. Of the remaining, she spent on travel and food in the ratio of 7:5. If the difference of the income spent on travel and food is Rs.612, then find her monthly income.
In a competitive examination containing 200 questions, 2 marks are awarded for every correct answer and 1 mark gets deducted for every wrong answer. If a student attempted all questions and obtained 97 marks, how many wrong answers must he have given?
In 2011, the total population of a village was 5280, Out of which 30% were female. In 2012, the total population increased by 10% in comparison to the previous year. If the number of females remained the same in 2012, what was the approximate percentage increase in the number of males in 2012 in comparison to 2011?
A man invested all his current month income in starting of a new business in which he spends 40% in advertisement 10% of remaining in furniture 20% of remaining in gadgets and remaining Rs 135000 in miscellaneous. Find amount spend on gadget is what percent more or less than amount spend on advertisement.
A invested a certain amount in Debt and Equity mutual funds in the ratio of 3: 4 respectively. At the end of one year, he earned a total dividend of 20% on his investment. After one year he reinvested the amount including dividend in the ratio of 2: 3 in Debt and Equity mutual Funds. If the amount reinvested in Equity mutual Funds was Rs. 94,500, what was the original amount invested in Equity mutual Funds?
What was the percentage increase of land under cultivation in Punjab in the year 2013 as against 2011?
Sonu saves 15% of her income. If her income increases by 20% and she still saves the same amount as before, then what is the percentage increase in her expenditure? (correct to one decimal place)
Monthly savings of X is 50% of his monthly income which is Rs. 9000. If ratio of monthly expenditure of Y and X is 15:8 respectively and monthly savings of X is 25% more than that of Y then find monthly income of Y.

Relevant for Exams:

IBPS SO

Question

A student multiplied a number by 8/5 instead of 5/8. What is the percentage error in the calculation?

Solution

Relevant for Exams:

I Pledged to: