An umbrella is 20 yuan, a rain cape is 15 yuan, and a pair of rain boots is 35 yuan. If you buy 20 pieces of each of the three commodities, how much is the total cost?
一把伞20元，一件雨披15元，一双雨鞋35元，如果三种商品各买20件，一共要多少元．
<gadget id="calculator">20 + 15 + 35</gadget>
<output>70</output>

<gadget id="calculator">70 * 20</gadget>
<output>1_400</output>

<result>1_400</result>