Talk:Attack speed/@comment-1157851-20110616202716/@comment-4076431-20110619183714

Kayle's attack_delay is -0.02

Base attack speed = 0.625 / (1 - 0.02) = 0.625 / 0.98 = 125/196 (approx. 0.638)

Kayle gains 2.30% bonus attack speed per level.

125/196 * (100% + (2.3% * 17 levels))

125/196 * (100% + 39.1%)

125/196 * 139.1% = 0.88711734693877551020408163265306

That gets rounded to the 0.887 written in game.