When a stationery store buys a batch of the same pens, it needs to add a certain profit (earned money) to the price of each pen when it sells them. (2/3) of the pens are sold at this price. , just recover 80% of the total cost of this batch of pens (the money spent by the store to purchase these pens). how much higher the price
某文具商店购进一批同样的钢笔，销售时需要在每枝钢笔进价的基础上增加一定的利润(赚的钱)定价出售，按此定价售出这批钢笔的(2/3)时，正好收回这批钢笔全部成本(商店购进这批钢笔时所花的钱)的80%，这时商店在原定价的基础上打九折进行促销活动，这时每枝钢笔的售价比进价高了多少
<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

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

<gadget id="calculator">(6/5) * (9/10)</gadget>
<output>27/25 = around 1.08</output>

<gadget id="calculator">(27/25) - 1</gadget>
<output>2/25 = around 0.08</output>

<result>2/25 = around 0.08</result>