Alright, let's work through 1920 times 7980 step by step
1920 × 7980 = 7980 × (1920)
+ 7980 × 0 resulting in 0
+ 7980 × 20 that equals 159600
+ 7980 × 900 yielding 7182000
+ 7980 × 1000 what gives us 7980000

= 15321600
