Alright, let's work through 8540 times 8611 step by step
8540 × 8611 = 8611 × (8540)
+ 8611 × 0 resulting in 0
+ 8611 × 40 giving us 344440
+ 8611 × 500 what gives us 4305500
+ 8611 × 8000 that is equal 68888000

= 73537940
