It's can be 5×10^4
5×10^4= 5×10000=50,000
        
             
        
        
        
Sales tax = 6% or 6/100. 
assuming tax is added onto the item:
total cost function f(x) = price + tax
however, assuming the cost price = sales price  - tax,  then:
f(x) = sales price - tax 
This is not really a business or accounting forum, its a maths forum, so you need to be clearer about business or accounting terms such as total cost, selling price, selling cost.
        
             
        
        
        
Answer:
s = -77
Step-by-step explanation:
 
        
                    
             
        
        
        
Rounded to the nearest hundred would be 274,389,451,400
        
             
        
        
        
If x equals the number, then seven times the number is 7x; three less than that is 7x-3.