Question 1198460
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If he has equal amounts returning 8% and 15%, then his average return is (8+15)/2 = 11.5%.<br>
The amount of his return on his investment of $x is $690:<br>
{{{0.115x = 690}}}
{{{x = 690/0.115 = 6000}}}<br>
ANSWER: $6000<br>
Formal algebra, if required....<br>
x = total invested, so 0.5x returning 8% and 0.5x returning 15%:<br>
{{{.08(.5x)+.15(.5x)=690}}}
{{{.04x+.075x=690}}}
{{{.115x=690}}}
{{{x=690/.115 = 6000}}}<br>