The price of 500 grams of tea leaves is 198 yuan, and 50 grams will be given away for every 500 grams purchased. Uncle Li wants to buy 1.1 kilograms of tea leaves, how much should he pay?
茶叶500克售价198元，每买500克赠送50克，李叔叔要买1.1千克茶叶，应付多少钱？
<gadget id="calculator">500 / 1_000</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">50 / 1_000</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/2) + (1/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1.1 / (11/20)</gadget>
<output>2</output>

<gadget id="calculator">2 * 198</gadget>
<output>396</output>

<result>396</result>