Successive monthly increases: An employee’s salary increases every month by 4%. If his salary in August was ₹6,300, what is his approximate salary in October of the same year?
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A₹ 6552
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B₹ 6967
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C₹ 6814
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D₹ 6627
Answer
Correct Answer: ₹ 6814
Explanation
Introduction / Context:This is a successive percentage increase problem (compound growth). Two monthly increases of 4% are applied to reach October from August (August → September → October).Given Data / Assumptions:
- August salary = ₹6,300.
- Monthly increase = 4%.
- Two steps of increase to reach October.
Concept / Approach:Use the compound growth factor (1.04) for each month. After two months, the multiplier is (1.04)^2. Then round to the nearest rupee if required by the options.
Step-by-Step Solution:
September salary = 6300 * 1.04 = 6552.October salary = 6552 * 1.04 = 6814.08.Approximately ₹6,814 (matching the option).Verification / Alternative check:Direct two-step factor: October = 6300 * (1.04)^2 = 6300 * 1.0816 = 6814.08. Same result.
Why Other Options Are Wrong:
- ₹6552: That is September’s salary, not October’s.
- ₹6627 and ₹6967: Do not correspond to exactly two 4% increases from ₹6300.
Common Pitfalls:Applying a flat 8% once (ignoring compounding) would give 6300*1.08 = 6804, close but not equal. Successive increases require multiplying by 1.04 twice.
Final Answer:
₹ 6814