No problem, we've got 4280 and 3625 to multiply
4280 × 3625 = 3625 × (4280)
+ 3625 × 0 that equals 0
+ 3625 × 80 resulting in 290000
+ 3625 × 200 that equals 725000
+ 3625 × 4000 resulting in 14500000

= 15515000
