In a week, the parlor would make about $300 from milkshakes
The total amount the ice cream parlor makes in a week is dependent is the product of the number of days in a week , the number of milkshakes sold in a day and the price of a milkshake.
Total amount = number of milkshakes sold in a week x price of a milkshake
There are 7 days in a week, in a week the parlor would sell : 11 x 7 = 77 milkshakes
price of a milkshake = $3.99
77 x $3.99 = $307.23
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