A customer bought 6 bottles of wine and paid 1.3 yuan for each bottle. When returning the empty bottles, the salesperson said that the price of each empty bottle was 1.1 yuan less than the price of the wine. How much is the bottle price that the customer should return.
一个顾客买了6瓶酒，每瓶付1.3元，退空瓶时，售货员说，每只空瓶钱比酒钱少1.1元，顾客应退回的瓶钱是多少元．
<gadget id="calculator">1.3 + 1.1</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 / 2</gadget>
<output>1.2</output>

<gadget id="calculator">1.3 - 1.2</gadget>
<output>0.1</output>

<gadget id="calculator">6 * 0.1</gadget>
<output>0.6</output>

<result>0.6</result>