the sum of all interior angles in a polygon is
180( n - 2)
n = number of sides
now, this polygon is a quadrilateral, so it has 4 sides, so it's total is just 180( 4 - 2) = 360.
![360=x+4x+3x+2x\implies 360=10x\implies \cfrac{360}{10}=x\implies 36=x](https://tex.z-dn.net/?f=360%3Dx%2B4x%2B3x%2B2x%5Cimplies%20360%3D10x%5Cimplies%20%5Ccfrac%7B360%7D%7B10%7D%3Dx%5Cimplies%2036%3Dx)
3/2, or any equivalent
1/2 = 50%
50% x 3 = 150%
1/2 x 3 = 3/2, or 1 1/2 as a mixed number
77%
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