class marginal_calc:
    
    def __init__(self,value):
        
        self.value = value
    
    def calculate(self):
        
        bracket = [0,12500,50000,150000]
        percentage = [0,0.2,0.4,0.45]
        
        bracket.append(self.value)

        bracket = [num for num in bracket if num <= self.value]
        
        bracket = list(set(bracket)) 
        
        bracket.sort()
        
        
        p2 = []
        
        count = 0
        while count < (len(bracket)-1):
            p2.append(percentage[count])
            count+=1
    
        
        lst = []
        
        index = 0
        while index < len(bracket)-1:
            a = index
            if index > 0:
                b = (bracket[a]-bracket[a-1] )* p2[a-1]
                lst.append(b)
            index = index + 1

        return('total',sum(lst))
    
print(marginal_calc(30000).calculate())