Alright, let's work through 8515 times 2100 step by step
8515 × 2100 = 2100 × (8515)
+ 2100 × 5 producing 10500
+ 2100 × 10 what gives us 21000
+ 2100 × 500 that is equal 1050000
+ 2100 × 8000 resulting in 16800000

= 17881500
