Alright, let's work through 2550 times 3960 step by step
2550 × 3960 = 3960 × (2550)
+ 3960 × 0 giving us 0
+ 3960 × 50 which equals 198000
+ 3960 × 500 which equals 1980000
+ 3960 × 2000 which equals 7920000

= 10098000
