The price of 500 grams of tea leaves is 90 yuan, and 0.05 kilograms will be given away for every 500 grams purchased. Uncle Li wants to buy 3.3 kilograms of tea, how much should he pay?
茶叶500克售价90元，每买500克赠送0.05千克．李叔叔要买3.3千克的茶叶，应付多少元．
<gadget id="calculator">500 / 1_000</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) + 0.05</gadget>
<output>0.55</output>

<gadget id="calculator">3.3 / 0.55</gadget>
<output>6</output>

<gadget id="calculator">6 * 90</gadget>
<output>540</output>

<result>540</result>