Alright, let's work through 2588 times 155 step by step
2588 × 155 = 155 × (2588)
+ 155 × 8 what gives us 1240
+ 155 × 80 resulting in 12400
+ 155 × 500 which equals 77500
+ 155 × 2000 producing 310000

= 401140
