Mr. Zhang went to the store to buy volleyballs. Each volleyball was 75 yuan. After Mr. Zhang bought 20 volleyballs, there was 40 yuan left. How much did Mr. Zhang bring?
张老师去商店买排球，每个排球75元，张老师买了20个排球后剩了40元，张老师带来多少钱？
<gadget id="calculator">75 * 20</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 + 40</gadget>
<output>1_540</output>

<result>1_540</result>