$16,687 is Invested,part at 12% And the rest at 8% if the interest earned from the amount invested at 12% exceeds the interest earned from the amount invested at 8% by $1903.24 how much is invested at each rate

Answer 1

if $x is at 12%, the rest (16687-x) is at 8%. So,
0.12x = 0.08(16687-x) + 1903.24