I bought 3 kilograms of bananas and 2 kilograms of apples. The price of 1 kilogram of apples is 2 yuan, and 1 kilogram of bananas is 1 yuan more expensive than apples. How much should I pay in total?
买了3千克香蕉和2千克苹果，1千克苹果的价钱是2元，1千克香蕉比苹果贵1元，一共要付多少钱．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">9 + 4</gadget>
<output>13</output>

<result>13</result>