11% of what equals 55.50?

Question

Need to know the cost (55.50) before the 11% tip

Answer 1

Let the cost be  x

11% of x=55.50

x=55.50(100/11)=504.54

 

or

Did you mean

cost +tip=55.50

cost +11%cost=55.50

1.11cost=55.50

cost=55.50/1.11= 50