Problema Solution
Eva invested a certain amount of money at 10% interest and $1700 more than that amount at 15%. Her total yearly interest was $815. How much did she invest at each rate?
Answer provided by our tutors
.10x + .15(x + 1700) = 815
.10x + .15x + 255 = 815
.25x + 255 = 815
.25x = 560
x = 2240
She invested $2240 at 10% and $3940 at 15%.