Alright, let's work through 5840 times 8602 step by step
5840 × 8602 = 8602 × (5840)
+ 8602 × 0 which equals 0
+ 8602 × 40 what gives us 344080
+ 8602 × 800 giving us 6881600
+ 8602 × 5000 which equals 43010000

= 50235680
