Buffet dinner at a restaurant costs Tk 35.50 . If the sales tax was more than 10 percent but less than 15 percent of the pre-tax cost of the dinner, then the total amount paid must have been between--

A Tk 40 & Tk 42
B Tk 39 & Tk 41
C Tk 38 & Tk 40
D Tk 37 & Tk 39

Correct Answer: Tk 39 & Tk 41

The minimum value of 10% including tax = 35.50 + 3.55 = 39.05 and the maximum value of 15% including tax = 35.50 + 5.325 = 40.825 So, the total amount will be paid Tk. 39 and tk. 41
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