from my understanding total cost is variable cost added to fixed cost, but i can not figure out the fixed cost. please help

Presidio, Inc, produces one model of mountain bike. Partial information for the company follows: Required: 1. Complete Presidio's cost data table. 2. Calculate Presidio's contribution margin ratio and its total contribution margin at each sales level indicated in the cost data table assuming the company sells each bike for $640. 3. Calculate net operating income floss) at each of the sales levels assuming a sales price of $640. Complete Presidio's cost data table. (Round your Cost per Unit answers to 2 decimal places.)