Minmin's mother bought a soymilk machine. She paid the salesperson eight pieces of 50 yuan, and got back 12 yuan. How much is this soymilk machine?
敏敏的妈妈买了一台豆浆机，她付给售货员8张50元的人民币，找回12元，这台豆浆机多少元？
<gadget id="calculator">8 * 50</gadget>
<output>400</output>

<gadget id="calculator">400 - 12</gadget>
<output>388</output>

<result>388</result>