Posted by **Drew** on Sunday, March 3, 2013 at 11:32pm.

Althea invested $10,000 for one year, part at 7% and part at 6 1/4%. If she earned a total interest of

$656.50, how much was invested at each rate?

- Math -
**Dr. Jane**, Monday, March 4, 2013 at 9:30am
x = amount at 7%

y = amount at 6.25%

x + y = 10,000 or x = 10,000 - y

.07x + .0625y = 656.50

You can solve by substitution:

.07(10,000 - y) +.0625y = 656.50

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