Alright, let's work through 8390 times 1500 step by step
8390 × 1500 = 1500 × (8390)
+ 1500 × 0 what gives us 0
+ 1500 × 90 resulting in 135000
+ 1500 × 300 producing 450000
+ 1500 × 8000 which equals 12000000

= 12585000
