Terry Edwards invested $3000 for two years, part at 3.5% simple interest and the rest at 2.5% simple interest. After two years she earned a total interest of $190. How much was invested at each rate?

Answer 1

x at 3.5%, so the rest (3000-x) at 2.5%

Now just add up the interest:

.035x + .025(3000-x) = 190