The students of Class 4 and Class 1 went on an outing on the National Day, and Teacher Wang took 216 photos for them. A box of film can take 36 photos. It is known that each box of film is 18 yuan. How much did Mr. Wang spend on buying these films?
"国庆"节四1班的同学去郊游，王老师一共给他们照了216张照片．一盒胶卷能照36张照片，已知每盒胶卷18元，王老师买这些胶卷共花了多少元．
<gadget id="calculator">216 / 36</gadget>
<output>6</output>

<gadget id="calculator">6 * 18</gadget>
<output>108</output>

<result>108</result>