Talk:Summer 2015 Event/@comment-122.111.34.78-20150825112451/@comment-25174240-20150825115925

You're forgetting basic Kancolle theory in your calculations.

http://kancolle.wikia.com/wiki/Combat#Basic_Attack_Power

Basic attack power at night =  firepower stat + torp stat , after that you begin to apply all the formula for damage.