Alright, let's work through 7904 times 2561 step by step
7904 × 2561 = 2561 × (7904)
+ 2561 × 4 which equals 10244
+ 2561 × 00 resulting in 0
+ 2561 × 900 what gives us 2304900
+ 2561 × 7000 that results in 17927000

= 20242144
