Civil Service Exam Reviewer · Percentage · hard
The length of a rectangle is increased by 40% and its width is decreased by 20%. What is the percent change in its area?
- 20% increase
- 12% decrease
- 17% increase
- 12% increase
Answer
D. 12% increase
Solution
New area factor = 1.4 × 0.8 = 1.12 → 12% increase.
More Percentage questions
- 40 liters of a 30% alcohol solution are mixed with 45 liters of a 50% alcohol solution. What is the alcohol concentration of the mixture?
- A town has a population of 7,000. If it grows by 10% each year, what will the population be after 2 years?
- A trader marks up an item costing ₱1,500 by 25%, then sells it at a 10% discount. What is the percent profit based on cost?
- After a 20% discount, a cellphone sells for ₱2,720. What was its original price?
- A receipt shows a VAT-inclusive total of ₱11,032. How much of this is the 12% VAT?
- The price of a product was increased by 40% and then decreased by 50%. What is the net percent change?
- A store gives successive discounts of 15% and 10%. What single discount is equivalent to these?
- An employee's monthly salary is ₱47,000. If 8% is deducted for taxes and contributions, what is the take-home pay?
- A sales agent earns a monthly base pay of ₱11,000 plus 3% commission on sales. How much does she earn in a month with sales of ₱460,000?
- 315 is 30% of what number?