The Pharoah Company sells sports decals that can be personalized with a player's name, a team name, and a jersey number for $9.00 each. Pharoah's variable costs are the $2.70 it pays its supplier for each decal and $0.70 in operating costs to personalize and sell each decal. The results of last month's operations are as follows: (a1) Calculate contribution margin per unit. (Round answer to 2 decimal places, e.g. 0.38.) Contribution margin per unit $ per unit