Alright, let's work through 9985 times 3928 step by step
9985 × 3928 = 3928 × (9985)
+ 3928 × 5 yielding 19640
+ 3928 × 80 that is equal 314240
+ 3928 × 900 which equals 3535200
+ 3928 × 9000 which equals 35352000

= 39221080
