Alright, let's work through 9992 times 7760 step by step
9992 × 7760 = 7760 × (9992)
+ 7760 × 2 which equals 15520
+ 7760 × 90 which equals 698400
+ 7760 × 900 yielding 6984000
+ 7760 × 9000 which equals 69840000

= 77537920
