A movie ticket is 15 yuan. After the price is reduced, the audience increases by half and the income increases by 20%. What is the price of the ticket after the price reduction?
电影票15元一张，降价后观众增加一半，收入增加20%，则降价后门票为多少元一张．
<gadget id="calculator">100 * 15</gadget>
<output>1_500</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 * 15 * (1/5)</gadget>
<output>300</output>

<gadget id="calculator">1_500 + 300</gadget>
<output>1_800</output>

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

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">1_800 / 150</gadget>
<output>12</output>

<result>12</result>