Alright, let's work through 8403 times 7680 step by step
8403 × 7680 = 7680 × (8403)
+ 7680 × 3 that is equal 23040
+ 7680 × 00 giving us 0
+ 7680 × 400 resulting in 3072000
+ 7680 × 8000 producing 61440000

= 64535040
