20% x 50 =(20 / 100) x 50 = (20 x 50) / 100 = 1000 / 100 = 10 
answer is 10
 
        
                    
             
        
        
        
Sorry but I don’t understand your language.
        
             
        
        
        
Answer:

Step-by-step explanation:
x is the number of years. y is the population after x years.
Each year, the population decreases by 22%, since 100% - 22% = 78%, and 78% = 0.78, each year, the population is 0.78 of the previous year's population.
year zero: y = 300
year 1: y = 300 * 0.78 = 300 * (0.78)^1
year 2: y = (300 * 0.78) * 0.78 = 300 * (0.78)^2
year 3: y = ((300 * 0.78) * 0.78) * 0.78 = 300 * (0.78)^3
year x: y = 300(0.78)^x
 
        
             
        
        
        
I think it’s $34 but i’m not sure