Sherry saved $1800 she earned at her summer job. She invested part of her money in a Treasury Bill at 5% and the balance in a Money Market fund which guaranteed a return of 10%. If she earned $165 on her investments in the first year, how much was invested at each rate?

Answer 1

amount at 5% --- x

solve for x:

.05x + .1(1800-x) = 165