The children's goods store plans to have a sales of 10,000 yuan for the whole day on June 1. The actual sales in the morning are (3/4) 10,000 yuan, and the sales in the afternoon are (1/2) 10,000 yuan. How much is the excess of the whole day?
儿童用品商场计划六月一日全天的销售额为1万元，实际上午销售(3/4)万元，下午销售(1/2)万元，全天超额多少万元？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) - 1</gadget>
<output>-1/2 = around -0.5</output>

<gadget id="calculator">(3/4) + (-1/2)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>