Limin store sells a pen, its purchase price is 5 yuan for 8 pens, and the selling price is 5 yuan for 6 pens. If the Wangwang small store sells this kind of pen to make a profit of 100 yuan, how many pieces of this kind of pen need to be sold.
利民商店出售一种笔，它的进价是8支5元，售价是6支5元．如果旺旺小商店销售这种笔要获利100元，需要售出这种笔多少支．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/6) - (5/8)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">100 / (5/24)</gadget>
<output>480</output>

<result>480</result>