Alright, let's work through 2640 times 8060 step by step
2640 × 8060 = 8060 × (2640)
+ 8060 × 0 giving us 0
+ 8060 × 40 that equals 322400
+ 8060 × 600 what gives us 4836000
+ 8060 × 2000 which equals 16120000

= 21278400
