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A sum was lent at simple interest. In 4 years it amounted to ₹9,200 and in 7 years to ₹11,000. Find the principal.
A₹6,400
B₹6,800
C₹7,000
D₹7,200
Answer & Solution
Correct answer: B. ₹6,800
1. SI for 3 years (7−4) = 11000 − 9200 = 1800; SI per year = 600.
2. SI for 4 years = 2400.
3. P = 9200 − 2400 = ₹6,800.
_Source: jkchrome SI-CI QB, p.4 — two-amount problem_
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