Lesson eLearning

A rural area has 150 km of roads. The government plans to increase this by 20 % each year for 3 years. How many kilometers of roads will the area have after 3 years? Round to nearest whole number.

hard 4 marks Class 7 · Geography · Human Environment - Settlement, Transport and Communication
Answer
259

The correct answer is 259 — Round (259.2) to nearest whole number: (259) km.

Step-by-step solution

  1. Compute the yearly growth factor: (1 + 0.20 = 1.20).
  2. After 1 year: (150 \times 1.20 = 180) km.
  3. After 2 years: (180 \times 1.20 = 216) km.
  4. After 3 years: (216 \times 1.20 = 259.2) km.
  5. Round (259.2) to nearest whole number: (259) km.
Common mistake: Adding 20 % only once instead of compounding each year

Concept tested: Transport infrastructure growth

Published · How this solution was prepared and checked

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