Answer:
d) $6,180, and its profit amounts to $25,750.
Explanation:
At output 515, average variable cost is $113
VC = AVC * Q
   = $113 x 515
   = $58,195
TC = ATC * Q
   = $125 x 515
   = $64,375
Now calculate for Fixed Cost
Total Cost (TC) = VARIABLE COST (VC) + FIXED COST (FC)
FC = TC - VC
   = $64,375 - $58,195
   = $6,180
Calculate for profit
Profit = TR - TC
     = $90,125 - $64,375
     = $25,750