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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?

Correct Answer: 7%
Defective parts in the shipment of 120  = 5% of 120 = (5/100) ×120 = 6 Defective part in the shipment of 80 = 10% of 80  = (10/100)​ ×80 = 8 ∴ Total machine parts = 120 + 80 = 200 Total defective parts = 6 + 8 = 14 % of defective parts = {(14/200)×100}% = 7% 

In a shipment of 120 machine parts 5 percent , 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 ?

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