Let the selling price of the 1st ring be $ x.
So, the Price of 2nd ring= $(x+50)
And the price of 3rd ring=&(x+50-600)=$(x-550)
Also total price=$1750
∴Price of 1st ring=x= $750
Price of 2nd ring=x+50=750+50= $800
Price of 3rd ring=x-550=750-550= $200