Give the answer and explain how you got it

And employee salary increased by $4500 which represents a 15% raise what is the rate of the increase

Answer this 30 points and brainliest!

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x