On day one, a store sold 100 hats. On each of the next d days, the company sold 70 hats. If the average daily sales of hats over this time period (including day one) is 75 hats, what is the value of d?
Choose the correct choice from the following:
A) 5	B) 6	C) 7	D) 8	E) 9
100 + 70d = 75(d+1).   5d = 25.   d = 5.   The answer is 5.
<result>A</result>
On day one, a store sold 100 hats. On each of the next d days, the company sold 70 hats. If the average daily sales of hats over this time period (including day one) is 75 hats, what is the value of d?