Alright, let's work through 2515 times 7104 step by step
2515 × 7104 = 7104 × (2515)
+ 7104 × 5 producing 35520
+ 7104 × 10 what gives us 71040
+ 7104 × 500 giving us 3552000
+ 7104 × 2000 that equals 14208000

= 17866560
