Alright, let's work through 7964 times 3905 step by step
7964 × 3905 = 3905 × (7964)
+ 3905 × 4 yielding 15620
+ 3905 × 60 yielding 234300
+ 3905 × 900 resulting in 3514500
+ 3905 × 7000 what gives us 27335000

= 31099420
