The original price of shirts A and B are the same. A shopping mall launched a "National Day" promotional activity. Type A shirts are sold at a 30% discount, and Type B shirts are sold at a 20% discount. Dad buys one of these two types of shirts for a total of 180 yuan. Find the original price of the shirt.
甲、乙两种衬衣的原价相同．某商场开展"庆国庆"促销活动，甲种衬衣按七折销售，乙种衬衣按八折销售，爸爸购买这两种衬衣各一件，共用去180元．求衬衣的原价．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(7/10) + (4/5)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">180 / (3/2)</gadget>
<output>120</output>

<result>120</result>