BUgging M1

THis is supposed to be simple!! But I can't get the answer from the book.

Book ans=36.9N for friction 43.3 N for force parallel to slope.

I got the 43.3 but the friction I cant get! Ahh.

Question.

A block of mass 10kg rests on a rough surface inclined at 30degrees to the horizontal. The coefficent of friction is 0.3. A horizontal force of 50N is applied to the block,tending to push the block up the slope. Investigate whether or not the block moves.

HELP! I tried all sorts of stuff! Even reverse engineering with the answer!

Where does the question come from? The force parallel to the slope is 43.3N minus the gravitational component - so it is wrong to state force parallel to plane is 43.3N and I don't think the text book would give such an answer.