Alfred’s Coffee Shop offers a “buy six cups of coffee, get one free” discount, and Boris’s Coffee Shop offers 15% off all orders of six or more cups of coffee. At both shops, the regular price of a single cup of coffee is $2.60.

Quantity A	Quantity B
The total cost for one order of seven single cups of coffee from Alfred’s	The total cost for one order of seven single cups of coffee from Boris’s

A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
_________________

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What I generally do to save time is instead of 2.60, I take 10 or 100 as we are dealing with percentage, 2.60 or 100 makes no difference.
10 and 100 will make things much simpler and you can solve this question in your head.