GWD 4-24

At a certain company, each employee has a salary grade s that is at least 1 and at most 5. Each employee receives an hourly wage p, in dollars, determined by the formula p = 9.50 + 0.25(s – 1). An employee with a salary grade of 5 receives how many more dollars per hour than an employee with a salary grade of 1?

A. $0.50

B. $1.00

C. $1.25

D. $1.50

E. $1.75

这道题其实挺简单的, 把5和1带到算式里就好了, 可是算来算去答案应该是B呀? 可是正确答案偏偏就是C? 各位大牛帮忙看看是怎么回事吧?