Me answer the question above (scroll and zoom on the picture)

Answer to part one: 544.20
Answer to part two: 196.17



Work Shown:

Part One:

Plug P = 400, r = 0.08, n = 1 and t = 4 into the compound interest formula

A = P(1+r/n)^(n*t)
A = 400(1+0.08/1)^(1*4)
A = 400(1+0.08)^(1*4)
A = 400(1.08)^(1*4)
A = 400(1.08)^(4)
A = 400(1.36048896)
A = 544.195584
A = 544.20



Part Two:

Follow the same steps as above but now use t = 8

A = P(1+r/n)^(n*t)
A = 400(1+0.08/1)^(1*8)
A = 400(1+0.08)^(1*8)
A = 400(1.08)^(1*8)
A = 400(1.08)^(8)
A = 400(1.85093021028188)
A = 740.372084112753
A = 740.37

Subtract this from the result in Part One
740.37 - 544.20 = 196.17

Let us assume the first odd number = x
Then the second consecutive odd number = x + 2
The third consecutive odd number = x + 4
The addition of the three consecutive odd numbers = 75
Then we can write the equation as
x + x + 2 + x + 4 = 75
3x + 6 = 75
3x = 75 - 6
3x = 69
x = 69/3
   = 23
Then
The greatest odd number in the question = X + 4
                                                                  = 23 + 4
                                                                 = 27
So the greatest odd number in the question is 27.