Question 1105498
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Interest + interest      = total interest


2100*x   + 1400*(x+0.02) = 168    <<<---=== where x is percentage for $2100 loan expressed as the decimal (like 3.5% = 0.0035 . . . )


2100x + 1400x + 28 = 168

3500x = 168 - 28 = 140  ====>  x = {{{140/3500}}} = 0.04 = 4%.


<U>Answer</U>.  $2100 was invested at 4%  and  $1400 was invested at 6%.


<U>Check</U>.   2100*0.04 + 1400*0.06 = 168 dollars.   ! Correct !
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