During the "Eleventh" period, all products in Gulou Clothing City will be sold at a reduced price (1/10). Mom bought a shirt for 63 yuan, how much cheaper than the original?
"十一"期间，鼓楼服装城所有商品一律降价(1/10)销售．妈妈花63元买了一件衬衣，比原来便宜多少元？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">63 / (9/10)</gadget>
<output>70</output>

<gadget id="calculator">70 - 63</gadget>
<output>7</output>

<result>7</result>