Struggling with this physics problem and don’t know what I’m doing wrong?

Anonymous
I’m struggling with this physics problem and need help on why I’m getting this wrong. The question is:

On a calm, bright day, you're scuba diving in a deep lake (n = 1.35), 6.20 m away from your sailboat in the horizontal direction. When you are 3.10 m below the surface, the top of the sailboat mast appears to you to be in a direction 33.0° from vertical. Calculate the height of the mast

what I’ve done is:

Step 1: Taking the arcsin Of the refractive index and the Sin of the given angle

Arcsin (1.35*sin (33))= 47.33

Step 2: subtract the answer from step 1 from 90

90-47.33= 42.67 degrees

Step 3: multiply the horizontal distance from the boat with the tangent of the answer from step 2 to get the height of the mast

6.2*tan (42.67)= 5.715 m

but my computer marks this as wrong. What am I doing wrong?
Struggling with this physics problem and don’t know what I’m doing wrong?
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