I'm not sure about the answer, but this is how I would do it, since 15% and $150 are the same based on the question. do let me know if it's right! :)
 
        
        
        
Answer: 50.4537849152
Hope this helped!
        
                    
             
        
        
        
If each burger is 1/4 th of a pound, he can make a maximum of 35 hamburgers
3 from the 3/4ths and 32 from the 8
32+3 = 35
        
             
        
        
        
Step-by-step explanation:
I didn't need the other angles, but right of the bat you can tell it's two right triangles back to back.
 <em>y </em> has to be 90° , as you have noticed they already gave you 70° on the right side of the shape meaning if you were to add 90 which is why plus 70 what would that give you? 160.
the total interior for a triangles angles has to be 180°. if you do the math 180 - 160 you get the leftover 20° for x.
I suck at explaining stuff, hope this helps
 
        
             
        
        
        
18 * 5 = 90
 90 represents 100%, because there are 5 20% in 100%
In total there are 90 club members 
80% = 71 do not have birthdays in the summer.