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3 milkshakes is .75
4 milkshakes is 1.00
1 milkshake costs 25 cents.
2 milkshakes costs 50 cents (0.25 x 2 = 0.50)
3 milkshakes costs 75 cents (0.25 x 3 = 0.75)
4 milkshakes costs 1 dollar (0.25 x 4 = 1)
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