The toll T, in dollars, for a truck using a certain bridge is given by the formula T = 1.50 + 1.50( x − 2), where x is the number of axles on the truck. What is the toll for an 18-wheel truck that has 2 wheels on its front axle and 4 wheels on each of its other axles? Choose the correct choice:
A) $ 2.50 B) $ 3.00 C) $ 3.50 D) $ 6.00 E) $ 5.00

Rationale: "number of wheels in truck = 18 number of wheels on its front axle = 2 number of wheels remaining = 16 number of axles remaining axles = 16 / 4 = 4 total number of axles = 5 t = 1.50 + 1.50 ( x − 2 ) = 1.50 + 1.5 * 3 = 1.5 + 4.5 = 6 $ answer d"
Answer: D