The movie theater has 40 tickets for A, 50 yuan each, and 100 tickets for B, 25 yuan each. The total box office revenue tonight is 4,000 yuan. How many audiences can sit at most?
电影院有甲票40张，每张50元，乙票100张，每张25元，今晚票房共收入4000元，最多坐了多少观众？
<gadget id="calculator">100 * 25</gadget>
<output>2_500</output>

<gadget id="calculator">4_000 - 2_500</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 / 50</gadget>
<output>30</output>

<gadget id="calculator">30 + 100</gadget>
<output>130</output>

<result>130</result>