No problem, we've got 2400 and 8172 to multiply
2400 × 8172 = 8172 × (2400)
+ 8172 × 0 that results in 0
+ 8172 × 00 what gives us 0
+ 8172 × 400 what gives us 3268800
+ 8172 × 2000 giving us 16344000

= 19612800
