Arithmetichard · Past Paper
If the radius of a circle is increased by 50%, find the percentage increase in its area.
A50%
B100%
C125%
D150%
✓ Correct Answer: C — 125%
Area depends on r^2. New area = (1.5r)^2 = 2.25r^2. Increase is 2.25 - 1 = 1.25 = 125%.
Share this question
More from Arithmetic
- If 13% VAT is added to a mobile set costing Rs. 15,000, what is the price after VAT?
- If $a/b = c/d = e/f = 3$, then $(2a^2 + 3c^2 + 4e^2) / (2b^2 + 3d^2 + 4f^2)$ is:
- Profit after selling an article for Rs. 524 is the same as loss after selling it for Rs. 452. The CP is?
- The ratio of income of A and B is 5:4 and their expenditure ratio is 3:2. If at the end of the year, each saves Rs 1600, then the income of A is:
- What is the simplest form of the ratio 15:25?