Answer:
m∡A = 100° 
m∡B = 50°
m∡C = 30°
Step-by-step explanation:
let 'x' = m∡B;  50°
let '2x' = m∡A;   100°
let 'x-20' = m∡C;   30°
x + 2x + x - 20 = 180
4x - 20 = 180
4x = 200
x = 50 
 
        
             
        
        
        
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C)
10hrs will get around 105 salaries
90hrs get 840+105=945
95 hours get 945+(105/2)=997.5
100 hours get 945+105=1050