Question 1116274
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(1) Divide the $8400 that was invested into two parts, one to be invested at 12% and the other at 8%.<br>
let x = amount invested at 8%
then (8400-x) = amount invested at 12%<br>
(2) Write and solve the equation that says the interest on the amount invested at 12% was 3 times the interest on the amount invested at 8%.<br>
interest at 12%: 0.12 times (8400-x)
interest at 8%: 0.08 times x
{{{0.12(8400-x) = 3*0.08(x)}}}<br>
I'll let you finish from there.