A total of $4,000 was invested, part of it at 6% interest and the remainder at 8%. If the total yearly interest amount is $260, how much was invested at 6%

1 answer

6% investment --- x
8% investment = 4000-x

.06x + .08(4000-x) = 260
times 100
6x + 8(4000-x) = 26000

solve for x