3. Required: 4. 1. High-Low Cost Estimation Method 5. a. Use the high-low method to estimate the per-unit variable costs and total fixed costs for the canoe product line. Variable cost per unit fill in the blank 1 Total fixed cost fill in the blank 2 6. b. Use the high-low method to estimate the per-unit variable costs and total fixed costs for the paddle product line. Variable cost per unit fill in the blank 3