The school bought 25 sets of desks and chairs, each desk is 120 yuan, and each chair is 40 yuan. How much is the total cost?
学校买了25套桌椅，每张办公桌120元，每张椅子40元，共需多少元？
<gadget id="calculator">120 + 40</gadget>
<output>160</output>

<gadget id="calculator">160 * 25</gadget>
<output>4_000</output>

<result>4_000</result>