A supermarket sells a batch of children’s double-backed schoolbags at a cost of 84 yuan each. Originally, 100 schoolbags could be sold per day at the fixed price, and each bag was sold at a profit of 25% of the cost. Later, it was sold at 90% of the priced price, and the daily sales increased to the original price. 3.5 times of that, according to this calculation, how much does the daily profit increase from the original?
某超市出售一批儿童双背书包，每只成本84元，原来按定价出售每天可售出100只，每只利润为成本的25%，后来按定价的90%出售，每天销售两提高到原来的3.5倍，照这样计算，每天利润比原来增加多少？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">84 * (5/4)</gadget>
<output>105</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">105 * (9/10)</gadget>
<output>189/2 = around 94.5</output>

<gadget id="calculator">(189/2) - 84</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">100 * 3.5</gadget>
<output>350</output>

<gadget id="calculator">(21/2) * 350</gadget>
<output>3_675</output>

<gadget id="calculator">84 * (1/4) * 100</gadget>
<output>2_100</output>

<gadget id="calculator">3_675 - 2_100</gadget>
<output>1_575</output>

<result>1_575</result>