What is the acceleration of the crate

[Physicspilot]

Homework Statement

A 100 kg crate is carefully placed with zero velocity on the incline. What is the
acceleration of the crate if theta= 40degrees? μk=0.25 and μs=0.35(between the box and the incline.

Homework Equations

The Attempt at a Solution

My assumption is that,the (coefficient of)static friction will have no effect because we are looking at when the box starts sliding down the incline .Having that in mind,

i came up with: ∑F=m*a:
μk-Fg*sin40=m*a
245-630=100*a
a=-3.84 *******but this is wrong. Thanks in advance

 

[Physicspilot]

Resolved by moi.I forgot to multiply the friction by cos40