A customer buys 6 bottles of soda and pays 1.30 yuan for each bottle. When returning the empty bottles, the price for each bottle is 1.1 yuan less than the water price. How much is the bottle returned by the customer?
一位顾客买了6瓶汽水，每瓶付1.30元，退空瓶时，每只瓶钱比水钱少1.1元，顾客退回的瓶钱是多少元．
<gadget id="calculator">1.3 - 1.1</gadget>
<output>0.2</output>

<gadget id="calculator">0.2 / 2</gadget>
<output>0.1</output>

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

<result>0.6</result>