The entrance ticket of the zoo is 1 yuan and 50 cents a piece. After the price is reduced, the audience will increase by half, and the income of the zoo will increase (1/4).
动物园的入场券1元5角一张，降价后观众增加一半，动物园的收入增加(1/4)，则一张入场券降价多少元．
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/2) * (1/4)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/2) + (3/8)</gadget>
<output>15/8 = around 1.875</output>

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

<gadget id="calculator">(15/8) / (3/2)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(3/2) - (5/4)</gadget>
<output>1/4 = around 0.25</output>

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