Exambodh - Practice Aptitude, Reasoning & GK Questions
Play Quiz
Quantitative Aptitude
hardQ. No. 5708-a-value-increases-by-10-percent-and-then-decreases-by-15-percent-what-is-the-net-percentage-change

A value increases by 10 percent and then decreases by 15 percent. What is the net percentage change?

Last Updated:

The percentage expression “A value increases by 10 percent and then decreases by 15 percent. What is the net percentage change” is evaluated with Net change % = increase − decrease − (increase × decrease ÷ 100)., producing '-6.5 as the option-specific result.

A'-6.5
B'-40.5
C21.5
D27.5
Correct Answer: '-6.5Your Answer: A

Explanation

Solving “A value increases by 10 percent and then decreases by 15 percent. What is the net percentage change” requires the relationship Net change % = increase − decrease − (increase × decrease ÷ 100).; substituting the stated quantities gives 10 − 15 − (10 × 15 ÷ 100) = -6.5%.; hence '-6.5 is the calculated result and option A is correct.

Important Notes

  • Method for “A value increases by 10 percent and then decreases by 15 percent. What is the net percentage change”: use Net change % = increase − decrease − (increase × decrease ÷ 100)..
  • Substitution for “A value increases by 10 percent and then decreases by 15 percent. What is the net percentage change” produces 10 − 15 − (10 × 15 ÷ 100) = -6.5%..
  • Verification for “A value increases by 10 percent and then decreases by 15 percent. What is the net percentage change”: retain the stated base quantity throughout the percentage calculation.

Related Questions

View All
6800-the-price-of-an-item-is-634-if-the-price-increases-by-12-percent-what-will-be-the-new-priceThe price of an item is ₹634. If the price increases by 12 percen...6799-if-a-b-108-70-what-percent-is-a-of-bIf A:B = 108:70, what percent is A of B?6798-if-a-b-87-80-what-percent-is-a-of-bIf A:B = 87:80, what percent is A of B?
Previous QuestionNext Question

Test your Percentage knowledge

Start Topic Test

FAQ

Percentage FAQs

Common questions and clear answers for this topic.

A value increases by 10% and then decreases by 15%. What is the net percentage change?

The answer is -6.5. Using Net change % = increase − decrease − (increase × decrease ÷ 100), 10 − 15 − (10 × 15 ÷ 100) = -6.5%.

Which formula is used?

Net change % = increase − decrease − (increase × decrease ÷ 100)

What is Percentage and how is it used in competitive exam problems?

Percentage means per hundred and is used to express a number as a fraction of 100. Formula: Percentage = (Value/Total Value) x 100. In competitive exams like SSC CGL, IBPS Bank PO, and CAT, percentage questions appear as: finding percentage of a number, percentage increase/decrease, percentage change, successive percentage change, and percentage in Data Interpretation.

What are the important percentage-fraction equivalents to memorize?

Important percentage-fraction equivalents: 10% = 1/10, 12.5% = 1/8, 16.67% = 1/6, 20% = 1/5, 25% = 1/4, 33.33% = 1/3, 37.5% = 3/8, 50% = 1/2, 62.5% = 5/8, 66.67% = 2/3, 75% = 3/4. Converting percentages to fractions makes calculations faster. For example: 25% of 480 = 480/4 = 120. Memorizing these fractions is essential for quick Quantitative Aptitude calculations.

How to calculate Percentage Increase and Decrease?

Percentage Increase = (Increase/Original Value) x 100. Percentage Decrease = (Decrease/Original Value) x 100. If price increases by x% then decreases by x%, net effect is a decrease of x squared/100 percent. For Successive Percentage Changes: if first change is a% and second is b%, overall change = a + b + (ab/100) percent. This formula is crucial for profit/loss and interest problems in competitive exams.

How to solve population growth problems using percentage?

Population problems use percentage increase formula. If population is P and annual growth rate is r%, then after n years: Population = P x (1 + r/100)^n. Example: Town population 50,000 grows at 10% per year. After 2 years = 50000 x 1.1 x 1.1 = 60,500. If growth rate decreases, use (1-r/100). These problems appear in SSC CGL, IBPS, and banking exams.

Same Topic MCQs

View All
The price of an item is ₹634. If the price increases by 12 percent, what will be th...If A:B = 108:70, what percent is A of B?If A:B = 87:80, what percent is A of B?