One out of every 500 light bulbs are defected. If 2 out of every 10 defected light bulbs have a broken glass and there are 12 broken glass light bulbs in the shipment, how many light bulbs total are there in the shipment? Pick
A) 2,000 B) 5,000 C) 10,000 D) 30,000 E) 52,000
out of 500 only 1 bulb is defective.So for 10 defective bulbs, we must have 5000 bulbs   Now out of these 10 bulbs, 2 bulbs, have broken glass   i.e 2 broken glass out of 5000 bulbs   12 broken glass will be from 30000 bulbs   Answer is 30,000
<result>D</result>
One out of every 500 light bulbs are defected. If 2 out of every 10 defected light bulbs have a broken glass and there are 12 broken glass light bulbs in the shipment, how many light bulbs total are there in the shipment?