Alright, let's work through 3855 times 4015 step by step
3855 × 4015 = 4015 × (3855)
+ 4015 × 5 resulting in 20075
+ 4015 × 50 giving us 200750
+ 4015 × 800 giving us 3212000
+ 4015 × 3000 that is equal 12045000

= 15477825
