Alright, let's work through 9981 times 7904 step by step
9981 × 7904 = 7904 × (9981)
+ 7904 × 1 producing 7904
+ 7904 × 80 producing 632320
+ 7904 × 900 what gives us 7113600
+ 7904 × 9000 that results in 71136000

= 78889824
