Question 399228
0.042x + 0.062(12,500 - x) = 669.50
==> 0.042x + 775 - 0.062x = 669.50
==> -0.02x  = -105.5
==> x = $5,275, the amount invested in 4.2%
and 12,500 - x = $7,225, the amount invested in 6.2%.