Posted by Dan on .
I invested $3,000, part at 2% and the rest at 5% simple interest. After 1 year, I earned a total of $117 in interest. How much did I invest at each rate?

Pre Algerbra 
Steve,
just add up the interest. With $x at 2%,
.02x + .05(3000x) = 117
x = 1100