Set the multiplier for each difficulty level: you will need to define the % markup for each of the levels.
Level 1 = no markup
Level 2 through 5 = enter a percentage to markup
You can also apply the difficulty multiplier to the entire cost of the service including the minimum and the base fee. By default, the multiplier only affects the price per 1,000 square feet.
For more information, see: Pricing Your Services - Customizable Pricing