Single, Double, Triple

An ice-cream shop sells 3 flavored scoops: lime, vanilla, and strawberry. Each customer may choose to buy single, double, or triple scoops, and no-one orders repeated flavor on the same cone.

For single scoop, the lime flavor costs 1 dollar each; vanilla 1.5 dollars each; and strawberry 2 dollars each. For double scoops, each order will get a discount of 31 cents off for any combination. For example, the double scoops of lime and strawberry flavors will cost 1+2-0.31=2.69 dollars. Finally, for the triple scoops of 3 flavors, it will be discounted to 3.79 dollars.

At the end of the day, 63 lime, 61 vanilla, and 56 strawberry scoops are sold, and the shopkeeper collects 249.75 dollars in total from all customers.

How many customers buy the ice-cream? Assume each ice-cream is sold per one person.

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