A kind of oil is priced at 198 yuan per 500 grams, and 0.05 kilograms will be given away when you buy 500 grams at a time. Director Zhang needs 2.75 kg of this kind of oil, how much should be paid?
一种油料每500克售价198元，一次买500克赠送0.05千克．张主任需要2.75千克这种油料，应付款多少元？
<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">2.75 / 0.55</gadget>
<output>5</output>

<gadget id="calculator">5 * 198</gadget>
<output>990</output>

<result>990</result>