Melanie and Jake are going to give away a king-sized candy bar if the player hits gray, a fun sized Snickers if they hit black and a dum dum if they hit white. They determine that a king-sized candy bar will cost them $1 a piece, a fun sized Snickers costs them $0.25 a piece, and a dum dum costs them $0.05 a piece. If they are charging $1 to play their game what is their expected profit per play?

(hint): the answer is in the question.

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the answer is $4.45. i started by figuring out the cost of the plates and napkins. the easiest way to figure this cost out is through the tax. we know the way they found the tax is by multiplying the cost of non-food items by the tax rate (5% or 0.5). so, all we have to do to find the cost before tax is set up an equation and work this formula backwards. the equation is 0.19=0.05x where x is the cost of the plates and napkins. now all you do is divide both sides by 0.05 to come up with 3.8=x. now that we know the cost of the plates and napkins is $3.80, all we have to do is subtract this cost from the total cost of $8.25 giving us the cost of the watermelon which is $4.45.