Alright, let's work through 7981 times 4905 step by step
7981 × 4905 = 4905 × (7981)
+ 4905 × 1 yielding 4905
+ 4905 × 80 yielding 392400
+ 4905 × 900 giving us 4414500
+ 4905 × 7000 producing 34335000

= 39146805
