Alright, let's work through 8320 times 2217 step by step
8320 × 2217 = 2217 × (8320)
+ 2217 × 0 yielding 0
+ 2217 × 20 giving us 44340
+ 2217 × 300 giving us 665100
+ 2217 × 8000 that results in 17736000

= 18445440
