First, let's simplify the expression within the parentheses:

6•8 = 48
48 ÷ 4 = 12
12 + 28 = 40

Next, let's substitute back into the original expression:

560 ÷ (720 ÷ 90) - 900 ÷ 50 • 3 + 40 ÷ 5

Let's simplify further:

560 ÷ 8 - 18 • 3 + 8
70 - 54 + 8

Finally, let's solve the remaining operations:

70 - 54 = 16
16 + 8 = 24

Therefore, the final answer is 24.