Alright, let's work through 8939 times 8400 step by step
8939 × 8400 = 8400 × (8939)
+ 8400 × 9 that results in 75600
+ 8400 × 30 resulting in 252000
+ 8400 × 900 giving us 7560000
+ 8400 × 8000 that results in 67200000

= 75087600
