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 0.7%, what fraction of the products was checked by worker y?	Choose the correct choice from the following options.
A) 2/3	B) 5/6	C) 7/8	D) 4/5	E) 5/8
x: 0.5% is 0.2%-points from 0.7%.   y: 0.8% is 0.1%-points from 0.7%.   Therefore the ratio of products checked by y:x is 2:1.   Thus, worker y checked 2/3 of the products.   The answer is 2/3.
<result>A</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 0.7%, what fraction of the products was checked by worker y?