Sophie has been saving money at a regular rate and noticed that x months after her 15th birthday, she had saved a total of 20x + 244 dollars. Which of the following statements correctly describes her savings plan? How did you get that answer?
A) By her 15th birthday, she had saved 20 dollars and was able to save an additional 224 dollars each month afterwards.
B) By her 15th birthday, she had saved 224 dollars and was able to save an additional 20 dollars each month afterwards.
C) She had saved a total of 244 dollars by her 16th birthday.
D) None of the above.
The solution gives detailed steps on setting a linear equation using the example of saving plan. All the formula and calcuations are shown and explained. An excel output is also included.