In every box of 120 bulbs, 5% are defective. If a company needs 4,000 non-defective bulbs, what is the minimum number of boxes that it has to purchase?
Explanation:
5% bulb are defective, i.e., 95% bulb are non-defective.
∴ Each box contains 120 × 95% = 114 non-defective bulbs.
⇒ Minimum number of boxes required = 4000/114 = 35.08
∴ The company has to purchase a minimum of 36 boxes to meet its requirement of bulbs.
Hence, option (d).
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