Each of the products produced yesterday was checked by worker x or worker y. 0.5% of the products checked by worker x are defective and 0.8% of the products checked by worker y are defective. If the total defective rate of all the products checked by worker x and worker y is 0.74%, what fraction of the products was checked by worker y?  Pick.
A) 1/2 B) 2/3 C) 3/5 D) 3/4 E) 4/5
x: 0.5% is 0.24%-points from 0.74%.   y: 0.8% is 0.06%-points from 0.74%.   Therefore the ratio of products checked by y:x is 4:1.   Thus, worker y checked 4/5 of the products.   The answer is 4/5.
<result>E</result>
Each of the products produced yesterday was checked by worker x or worker y. 0.5% of the products checked by worker x are defective and 0.8% of the products checked by worker y are defective. If the total defective rate of all the products checked by worker x and worker y is 0.74%, what fraction of the products was checked by worker y?