A, B, and C go to the store together to buy three kinds of goods A, B, and C. A buys 3 pieces of A, 5 pieces of B, and pays 200 yuan for 1 piece of C. B buys 4 pieces of A, 7 pieces of B, and 1 piece of C. The payment for one piece is 250 yuan, and C buys one piece of each of A, B, and C, how much yuan should be paid.
甲乙丙结伴到商店购买A、B、C三种货物，甲购A货物3件，B购物5件，C货物1件付款200元，乙购A货物4件，B购物7件，C货物1件付款250元，丙购A、B、C各一件，应付多少元．
<gadget id="calculator">400 - 250</gadget>
<output>150</output>

<gadget id="calculator">150 - 50</gadget>
<output>100</output>

<result>100</result>