15 students take a group photo together, pay 8.5 yuan for one shot, send 2 photos, and pay another 2.5 yuan for one additional photo. If each person wants a photo, how much should I pay in total?
15位同学一起照合影留念，拍一次付8.5元，送2张照片，加洗一张另付2.5元．如果每人要一张照片，一共应交多少钱？
<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<gadget id="calculator">13 * 2.5</gadget>
<output>32.5</output>

<gadget id="calculator">8.5 + 32.5</gadget>
<output>41</output>

<result>41</result>