Xiao Pang is a little sloppy. When calculating (□+50)*4, he miscalculated as □*4+50. Do you know how much the correct result differs from the wrong result?
小胖是个小马虎，在计算(□+50)*4时，错算成了□*4+50，你知道正确结果与错误结果相比，相差了多少？
<gadget id="calculator">200 - 50</gadget>
<output>150</output>

<result>150</result>