There are three kinds of goods A, B, and C. If you buy 3 pieces of A, 7 pieces of B, and 1 piece of C, the total cost is 13.15 yuan. If you buy 4 pieces of A, 10 pieces of B, and 1 piece of C, the total cost is 14.20 yuan. How much does it cost to buy one piece of A, B, and C now?
甲、乙、丙三种货物，如果购买甲3件，乙7件，丙1件，共花13.15元．如果购买甲4件，乙10件，丙1件，共花14.20元．现在购买甲、乙、丙各一件，共花钱多少元？
<gadget id="calculator">2 * 1.05</gadget>
<output>2.1</output>

<gadget id="calculator">13.15 - 2.1</gadget>
<output>11.05</output>

<result>11.05</result>