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In a motor of 120 machine parts, 5% parts were defective. In another motor of 80 machine parts, 10% parts were defective. For the two motors considered together, the percentage of defective machine parts was
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- 7
- 6.5
- 7.5
- 8
Correct Option: A
Defective parts of 120 machine parts
| = | = 6 | 100 |
Defective parts of 80 machine parts
| = | = 8 | 100 |
Total defective parts
= 6 + 8 = 14
∴ Required percent
| = | × 100 = 7% | 200 |
