Teacher Li took 45 students to swim. Tickets are 50 yuan for adults and half price for children. How much do they have to pay in total?
李老师带45名同学去游泳．门票成人50元一张，儿童半价，他们一共要付多少钱？
<gadget id="calculator">50 * 1</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">25 * 45</gadget>
<output>1_125</output>

<gadget id="calculator">50 + 1_125</gadget>
<output>1_175</output>

<result>1_175</result>