What is half the product of the sum of 50 times 125 and 75?
50乘125与75的和，所得的积的一半是多少？
<gadget id="calculator">75 + 125</gadget>
<output>200</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<gadget id="calculator">50 * 100</gadget>
<output>5_000</output>

<result>5_000</result>