Alright, let's work through 3680 times 4220 step by step
3680 × 4220 = 4220 × (3680)
+ 4220 × 0 what gives us 0
+ 4220 × 80 yielding 337600
+ 4220 × 600 that is equal 2532000
+ 4220 × 3000 that equals 12660000

= 15529600
