John and Lacey moved to CSU East Bay last quarter. John took 3 classes and got a
GPA of 3.5 while Lacey took 4 classes but she doesn't know her GPA.
Write a program that asks Lacey to enter the classes' scores out of 100 and calculates
and displays her GPA.
Please enter 1st, 2nd, 3rd and 4th score as 85, 92, 95 and 88 respectively.
GPA == 3.6