Aunt Zhang spent 840 yuan in September, of which living expenses accounted for (3/8) and daily expenses accounted for (1/4). How much more did living expenses exceed daily expenses?
张大妈九月份支出840元，其中生活开支占(3/8)，日用开支占(1/4)，生活开支比日用开支多多少元？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">840 * (3/8)</gadget>
<output>315</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">840 * (1/4)</gadget>
<output>210</output>

<gadget id="calculator">315 - 210</gadget>
<output>105</output>

<result>105</result>