Alright, let's work through 9921 times 5499 step by step
9921 × 5499 = 5499 × (9921)
+ 5499 × 1 that equals 5499
+ 5499 × 20 producing 109980
+ 5499 × 900 resulting in 4949100
+ 5499 × 9000 producing 49491000

= 54555579
