ratio-proportion-percentage-profit-loss-l2 MCQ — 10 Practice Questions with Answers

Explanation

Since the selling price 200 is less than the cost price 250, the transaction has a loss of 50. The standard base for loss percentage is cost price, so 50/250 x 100 = 20%. Karan should reject any solution using 200 as the base.

Explanation

The safest MCQ method is to name the base before calculating. Discount uses marked price, profit percentage uses cost price, population growth uses original population, and depreciation uses the earlier value. Meena should read the word 'growth' or 'depreciation' as a base warning.

Explanation

Girls are 2 parts out of 5 total parts. Forty percent is 40/100 = 2/5. The club girls are therefore 2/5 of 2/5, or 4/25 of the whole class. This hard item combines ratio with percentage base.

Explanation

Asha must scale both parts of the ratio by the same factor. Since 3 red parts become 24 red counters, one part is 8 counters. The blue side has 5 parts, so 5 x 8 = 40. This checks proportional reasoning, not addition.

Explanation

Take 100 as Devika's original value. A 10% increase makes it 110. A 10% decrease is now 10% of 110, which is 11, so the value becomes 99. This demonstrates why percentages must be tied to their current base.