Master Wang from the factory went to the store and bought 80kg of rice and 80kg of peanut oil. The unit price of rice was 2 yuan, and the unit price of peanut oil was 7 yuan. How much less is it to buy rice than to buy peanut oil? (solution in two ways)
工厂王师傅到商店买了80千克大米和80千克花生油，大米的单价是2元，花生油的单价是7元．买大米比买花生油少用多少元？(用两种方法解)
<gadget id="calculator">7 * 80</gadget>
<output>560</output>

<gadget id="calculator">2 * 80</gadget>
<output>160</output>

<gadget id="calculator">560 - 160</gadget>
<output>400</output>

<result>400</result>