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Question

In a shipment of 120 machine parts 5 percent were defective In a shipment of 80 machine parts 10 percent were defective. For the two shipments combined what percent of the machine parts were defective?

A
6.5%
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B
7.0%
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C
7.5%
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D
8.0%
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Solution

The correct option is B 7.0%
Defective parts in the shipment of 120
=5% of 120 =5100×120=6
Defective part in the shipment of 80=10% of 80
=10100×80=8
Total machine parts =120+80=200
Total defective parts =6+8=14
% of defective parts =(14200×100) = 7%

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