The original price of each pen in the stationery store was 7.50 yuan. During the "Six Day" celebration, the price of the pen was 7.00 yuan. How much cheaper?
文具店里钢笔原来每枝的售价是7.50元，庆"六一"活动中，钢笔的售价是7.00元，便宜了多少元？
<gadget id="calculator">7.5 - 7</gadget>
<output>0.5</output>

<result>0.5</result>