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2015-04-01T21:15:53+05:30

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Total cost =  60  +  0.5  q  + 0.3 q²
     q = quantity purchased.
 
Fixed cost =  60, as it does not change with the quantity purchased.  It is the cost when the quantity purchased is q = 0.

Variable cost = the variable part of the total cost.
           = 0.5 q + 0.3 q²
 Average variable cost = variable cost / quantity
         = 0.5 + 0.3 q

Total cost = fixed cost + q * average variable cost

marginal cost is the additional cost for purchasing qth item/article/commodity.
       = cost of buying q items  -  cost of buying q-1  items
       = (60 + 0.5 q + 0.3 q²)  -  [60 + 0.5 (q-1) +  0.3 (q-1)² ]
       = 0.5 + 0.6 q - 0.3
       = 0.2 + 0.6 q

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