In a shipment of 150 machine parts 10% were defective and in another shipment of 100 machine parts 5% were defective. For the two shipments combined, what percent of the machine parts were defective?

In a shipment of 150 machine parts 10% were defective and in another shipment of 100 machine parts 5% were defective. For the two shipments combined, what percent of the machine parts were defective?

A 7.5%

B 8%

C 8.5%

D 9%

Solution

Correct Answer: Option B

10% of 150+5% of 100/150+100 X 100%=8%