Benny, i am in the same boat i have 4 selections per race, but am considering to change to 2 but the way i am doing at the moment is like this.

Price $2-$3 = 5 units
Price $3-$4 = 4 units
Price $4-$7 = 3 units
Price $7-$12 = 2 units
Price $12-$20 = 1.5 units
Price $20 up = 1 units

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