Alright, let's work through 8485 times 4155 step by step
8485 × 4155 = 4155 × (8485)
+ 4155 × 5 that is equal 20775
+ 4155 × 80 what gives us 332400
+ 4155 × 400 which equals 1662000
+ 4155 × 8000 producing 33240000

= 35255175
