What should the jackpot be so that the casino make a profit?

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What value would the jackpot have to be, for the casino to have an expected profit of exactly thirty cents for each time a person plays the slot machine?

Hint: Let the amount of the jackpot be "x", do the steps to find the expected value by hand ( you can look up how to do this), and set it equal to what you want the expected value to be, and solve for x.