The purchase price of a pair of shoes is 120 yuan, and the selling price is (1/4) higher than the purchase price. In order to promote 10% off sales, the store will make a profit or a loss when selling this pair of shoes?
一双鞋子进价120元，售价比进价高(1/4)．店家为了促销九折销售，这双鞋子卖出店家是盈利或是亏损多少？
<gadget id="calculator">1 / 4</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">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">120 * (5/4) * (9/10)</gadget>
<output>135</output>

<gadget id="calculator">135 - 120</gadget>
<output>15</output>

<result>15</result>