Question 1105498
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You can use some logical reasoning to simplify the required calculations a bit.<br>
The "extra" 2% on the $1400 produces $28 in interest: {{{1400*.02 = 28}}}. The remaining $140 of interest is from the whole $3500 invested at the lower rate.<br>
{{{3500x = 140}}}
{{{x = 140/3500 = .04}}}<br>
The lower rate was .04 = 4%; so the higher rate was 6%.<br>
$2100 was invested at 4%; $1400 was invested at 6$.