Question 1201188
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The difference in the number of classes  14-8 = 6  costs  as much
as the difference of two total payments, i.e. 98-80 = 18 dollars.


Hence, each single class costs 18/6 = 3 dollars.


Thus fee per class is 3 dollars.


Then the monthly "flat" fee is  80-8*3 = 80-24 = 56 dollars.     <U>ANSWER</U>


<U>CHECK</U>.  The monthly "flat" fee, calculated by another way, is  

        98-3*14 = 98-42 = 56 dollars,  i.e. the same amount.
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Solved.