What is the difference between the smallest and largest of the following amounts?  $$\dfrac{1}{2}$$ of $$30$$, $$\dfrac{1}{3}$$ of $$36$$, $$\dfrac{1}{4}$$ of $$40$$, $$\dfrac{1}{5}$$ of $$60$$, $$\dfrac{1}{6}$$ of $$96$$. 
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