Alright, let's work through 2778 times 7100 step by step
2778 × 7100 = 7100 × (2778)
+ 7100 × 8 giving us 56800
+ 7100 × 70 that equals 497000
+ 7100 × 700 what gives us 4970000
+ 7100 × 2000 giving us 14200000

= 19723800
