Sorry, I don't understand your difficulty . . .
Just Desserts buys cheesecakes from general bakeries at $33.60 per cheesecake.
It then cuts each cheesecake into 16 slices and sells them to customers at $6.50 per slice.
Calculate the rate of markup on cost and the rate of markup on selling price.
The cost is: . per slice.
Each slice is sold for $6.50.
The markup is: . per slice.
Rate of markup on cost: .
Rate of markup on SP: .