Alright, let's work through 2520 times 1559 step by step
2520 × 1559 = 1559 × (2520)
+ 1559 × 0 producing 0
+ 1559 × 20 producing 31180
+ 1559 × 500 resulting in 779500
+ 1559 × 2000 giving us 3118000

= 3928680
