A cold drink store launched a campaign of "half price for the second cup of iced drinks in summer". Xiao Gang bought 2 cups of drinks and spent a total of 13 yuan and 50 cents. So how much is the original price of a cup of drink?
某冷饮店推出"夏日冰饮第二杯半价"活动，小刚买了2杯饮料共花了13元5角．那么一杯饮料的原价是多少元．
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">13 + (1/2)</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(27/2) / (3/2)</gadget>
<output>9</output>

<result>9</result>