Alright, let's work through 2778 times 50 step by step
2778 × 50 = 50 × (2778)
+ 50 × 8 resulting in 400
+ 50 × 70 that is equal 3500
+ 50 × 700 that is equal 35000
+ 50 × 2000 what gives us 100000

= 138900
