Alright, let's work through 8485 times 8478 step by step
8485 × 8478 = 8478 × (8485)
+ 8478 × 5 which equals 42390
+ 8478 × 80 what gives us 678240
+ 8478 × 400 giving us 3391200
+ 8478 × 8000 giving us 67824000

= 71935830
