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Q.

In a shipment of 120 machine parts, 5 percent were defective. In an another shipment of80 machine parts, 10 percent were also defective. For the two shipments combined, what percent of the machine parts were defective?

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a

75%

b

6.5 %

c

8.0%

d

7.0%,

answer is B.

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Detailed Solution

Total no. of machine pans m both the shipments = (120+ 80) = 200 Total defective machine parts in both the shipments

=120×5%+80×10%=6+8=14

Therefore. required %=14200×100=7%

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