No problem, we've got 4085 and 4900 to multiply
4085 × 4900 = 4900 × (4085)
+ 4900 × 5 what gives us 24500
+ 4900 × 80 that results in 392000
+ 4900 × 000 resulting in 0
+ 4900 × 4000 which equals 19600000

= 20016500
