Help with box on sled slope problem

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The problem involves a 20kg wood sled and a 10kg wood box on a 20-degree slope, with the box slipping when the tension in the rope exceeds a specific value. The coefficients of friction are 0.5 for static friction between the boxes and 0.06 for kinetic friction between the sled and the snow. The correct tension value at which the box begins to slip is 155 N, contrasting with the initial calculation of 188 N. The solution was reached after further analysis post-discussion.

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Help with box on sled slope problem!

I've attempted this question and have re done the question about 3 times, getting the same answer.

A rope attached to a 20kg wood sled pulls the sled up a 20 degree snow covered hill. A 10kg wood box rides on top of the sled. If the tension in the rope steadily increases, at what value of the tension does the box slip?
coefficient of static friction between 2 wooden boxes=0.5
coefficient of kinetic friction between sled and snow=0.06

Resolving forces, I seem to keep on ending up with 188 N, but the answer is 155 N.
 
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It's ok, I figured it out, always happens, 2 minutes after I post, the answer comes to me lol.
 

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