Mrs. A. invested $45,000; part at 5%, and part at 8%. The total interest on the investment was $3,150. How much did she invest at each rate?	Choose the correct choice from the following choices.
A) x=$15,000, y =$30,000	B) x=$12,000, y =$24,000	C) x=$8,000, y =$16,000	D) x=$10,000, y =$20,000	E) x=$13,000, y =$26,000
I approached this question like a mixture problem.   I don't like the wordingpartat 5% andpartat 8% because we have variables x and y in the answer choices and I have no idea which one is x or y.   Anyway here's how I did it.   0.05(x) + 0.08(y) = 0.07(x+y)   0.01(y) = 0.02(x)   y = 2x   Note: 0.07(x+y) because $3,150 is 7% of 45,000   In which answer choice is y = 2(x)   x=$15,000, y =$30,000nswer x=$15,000, y =$30,000
<result>A</result>
Mrs. A. invested $45,000; part at 5%, and part at 8%. The total interest on the investment was $3,150. How much did she invest at each rate?