Alright, let's work through 8020 times 8390 step by step
8020 × 8390 = 8390 × (8020)
+ 8390 × 0 that results in 0
+ 8390 × 20 producing 167800
+ 8390 × 000 that equals 0
+ 8390 × 8000 resulting in 67120000

= 67287800
