Alright, let's work through 7994 times 4000 step by step
7994 × 4000 = 4000 × (7994)
+ 4000 × 4 resulting in 16000
+ 4000 × 90 giving us 360000
+ 4000 × 900 resulting in 3600000
+ 4000 × 7000 producing 28000000

= 31976000
