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David opened a coffee shop and sold 60 mochas the first day at $2 per cup. He wants to increase the price per cup to increase his revenue. He found out that for every $0.25 increase, x, in the price per cup, the number of cups he sold decreased by 2 per day.
How can David find the equation which represents his daily revenue, in dollars, from mocha sales when the price is increased x times?