Class 7 Percentage Increase and Decrease — practice questions with answers

Comparing Quantities · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.

1. The price of a pen goes up from ₹20 to ₹25. By how many rupees has it increased?

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Answer: C) ₹5

Increase = new price − old price = 25 − 20 = ₹5.

2. Look at the bar graph. By what percent did the rainfall increase from June to July?

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Answer: D) 25%

Increase = 150 − 120 = 30 mm. Percent increase =

\frac{30}{120} \times 100 = 25%

. (Dividing by 150 gives 20%.)

3. A bus journey in Bengaluru took 50 minutes. After a new flyover opened, it takes 40 minutes. What is the percentage decrease in time?

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Answer: B) 20%

Decrease = 10 minutes.

\frac{10}{50} \times 100 = 20%

. (25% divides by 40.)

4. A storm knocked down 40% of the mangoes on a tree, and 180 mangoes were left. How many mangoes were on the tree before the storm?

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Answer: D) 300

180 is 60% of the original. Original =

180 \times \frac{100}{60} = 300

. Check: 40% of 300 = 120, 300 − 120 = 180. (450 treats 180 as 40%.)

5. A worker's daily wage was cut by 10%. By what percent must the new wage be raised to get back the original wage?

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Answer: C)

11 \frac{1}{9} %

Take ₹100 → ₹90 after the cut. To get back ₹10 on ₹90:

\frac{10}{90} \times 100 = 11 \frac{1}{9} %

. A 10% raise on ₹90 gives only ₹99.

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