The cafeteria bought 4 bags of flour, each bag was 45 kilograms, and each kilogram of flour was 2 yuan. How much did it cost to buy these flours?
食堂买来4袋面粉，每袋45千克，每千克面粉2元．买这些面粉一共用去多少元？
<gadget id="calculator">45 * 4 * 2</gadget>
<output>360</output>

<result>360</result>