A city of 12 lakh grows at 4 per cent per annum. What is its population after 2 years?
A12,97,920
B12,96,000
C12,48,000
D13,00,800
Answer & Solution
Correct answer: A. 12,97,920
1. Growth compounds, so A = P (1 + R/100) raised to n with P = 12,00,000 and R = 4.
2. After year 1: 1200000 x 1.04 = 12,48,000.
3. After year 2: 1248000 x 1.04 = 12,97,920.
4. Adding a flat 4 per cent of the original twice would give 12,96,000, which is the trap.
5. The gap of 1,920 people is the growth on the first year's growth.
_Source: syllabus Maths Ch7 'Comparing Quantities', TRY THESE after Example 10_
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