The shopping mall has launched a preferential reward activity. Anyone who purchases over 200 yuan can get a cash rebate of 50 yuan. Mom has 520 yuan. How much do you think she can buy at most?
商场开展优惠酬宾活动，凡购满200元可回赠现金50元，妈妈有520元，你认为她最多能买到多少钱的物品？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">520 + 100 + 50</gadget>
<output>670</output>

<result>670</result>