A table and a chair total 84 yuan, and the unit price of the chair is 25% less than that of the table. How much is a chair?
一张桌子和一把椅子共84元，椅子的单价比桌子少25%，一把椅子多少元？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) + 1</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">84 / (7/4)</gadget>
<output>48</output>

<gadget id="calculator">84 - 48</gadget>
<output>36</output>

<result>36</result>