The fruit shop sells 100 baskets of fruit a day, each basket is 50 kg, and 42 baskets are sold in the morning. How many kilograms more were sold in the afternoon than in the morning?
水果店一天卖出100筐水果，每筐50千克，上午卖出42筐．下午比上午多卖出多少千克？
<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<gadget id="calculator">100 - 84</gadget>
<output>16</output>

<gadget id="calculator">16 * 50</gadget>
<output>800</output>

<result>800</result>