Experimental Primary School bought 4 pairs of table tennis rackets and 50 table tennis balls. They paid 200 yuan and got back 5.5 yuan. Each pair of rackets was 38 yuan. How much is each ball?
实验小学买了4副乒乓球拍和50个乒乓球，付出200元，找回5.5元，每副拍38元，每个球几元？
<gadget id="calculator">38 * 4</gadget>
<output>152</output>

<gadget id="calculator">200 - 152 - 5.5</gadget>
<output>42.5</output>

<gadget id="calculator">42.5 / 50</gadget>
<output>0.85</output>

<result>0.85</result>