Alright, let's work through 7903 times 2005 step by step
7903 × 2005 = 2005 × (7903)
+ 2005 × 3 resulting in 6015
+ 2005 × 00 which equals 0
+ 2005 × 900 which equals 1804500
+ 2005 × 7000 yielding 14035000

= 15845515
