Alright, let's work through 8115 times 9729 step by step
8115 × 9729 = 9729 × (8115)
+ 9729 × 5 resulting in 48645
+ 9729 × 10 what gives us 97290
+ 9729 × 100 which equals 972900
+ 9729 × 8000 that results in 77832000

= 78950835
