Mrs. A. invested $21,000; part at 5%, and part at 8%. The total interest on the investment was $1,470. How much did she invest at each rate?	Choose one:
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=$7,000, y =$14,000
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 $1,470 is 7% of 21,000   In which answer choice is y = 2(x)   Answer x=$7,000, y =$14,000
<result>E</result>
Mrs. A. invested $21,000; part at 5%, and part at 8%. The total interest on the investment was $1,470. How much did she invest at each rate?