If you know that with 8 units of output, average fixed cost is $12.50 and average variable cost is $81.25, then total cost at this output level is:

The total cost at an output level of eight units is $750.

We have

Average Fixed Cost  (AFC)       $12.50

Average Variable Cost  (VC)   $81.25

Number of units                    8

We compute the total fixed cost (TFC) as follows:

We calculate Total Variable Cost (TVC) as:

Since Total Costs (TC) is nothing but the sum of total fixed costs and total variable costs,

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