There are 45 tons of yellow sand on the pier to be transported to the construction site. Big trucks can only transport 5 tons each time, and it costs 150 yuan to transport one truck; small trucks can only transport 3 tons each time, and it costs 100 yuan to transport one truck. Which car is cheaper? How much can it be cheaper in total?
码头上有45吨黄沙要运往工地．大卡车每次只能运5吨，运一车要150元；小卡车每次只能运3吨，运一车要100元．用哪种车运便宜？一共能便宜多少元？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">100 * 15</gadget>
<output>1_500</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<gadget id="calculator">150 * 9</gadget>
<output>1_350</output>

<gadget id="calculator">1_500 - 1_350</gadget>
<output>150</output>

<result>150</result>