Janet invested $10,000, part at 2% and part at 12%. If the total interest at the end of the year is $600, how much did she invest at 2%?

Answer 1

If x is at 2%, the rest (10000-x) is at 12%.
So, add up the interest and you have

.02x + .12(10000-x) = 600

Now just solve for x.