Alright, let's work through 2780 times 3520 step by step
2780 × 3520 = 3520 × (2780)
+ 3520 × 0 yielding 0
+ 3520 × 80 resulting in 281600
+ 3520 × 700 that equals 2464000
+ 3520 × 2000 resulting in 7040000

= 9785600
