Alright, let's work through 8111 times 9931 step by step
8111 × 9931 = 9931 × (8111)
+ 9931 × 1 that equals 9931
+ 9931 × 10 that results in 99310
+ 9931 × 100 that results in 993100
+ 9931 × 8000 yielding 79448000

= 80550341
