A company charges $7 for a T-shirt and ships any order for $22. A school principal ordered a number of T-shirts for the school store. The total cost of the order was $1,520. How many T-shirts did the principal order?
A. 69
B. 150
C. 214
D. 220
Let x be the number of T-shirts ordered by the principal.
The cost of the T-shirts is 7x.
The total cost of the order, including shipping, is 7x + 22.
According to the problem, 7x + 22 = 1520.
Subtracting 22 from both sides of the equation, we get 7x = 1498.
Dividing both sides by 7, we get x = 214.
The principal ordered 214 T-shirts.
The answer is C.