Alright, let's work through 4280 times 9120 step by step
4280 × 9120 = 9120 × (4280)
+ 9120 × 0 which equals 0
+ 9120 × 80 which equals 729600
+ 9120 × 200 which equals 1824000
+ 9120 × 4000 that is equal 36480000

= 39033600
