I've attached the graphs to this answer. I hope they help.
A) AED 4000
4000 x .10= AED 400 therefore 400 is 10% of 4000
So hmmm check the picture below
in an isosceles triangle, two sides are equal, and thus the angles those twin legs make, are also twin angles
let's say the angle made is "a", so all internal angles will be 64 + a + a = 180
or 64 + 2a = 180
thus 2a = 180 - 64 => 2a = 116, thus a = 116/2
The third one because it passes the vertical line test