MARKED price = 697/0.82 = Rs. 850Detailed solution:Given,Suresh purchased a shirt = Rs.697Discount percentage = 18%LET the marked price of a shirt be Rs. m.⇒ 697 = m - m × (18/100)⇒ 697 = m - 18m/100⇒ 69700 = 100m - 18m⇒ 69700 = 82m⇒ m = 69700/82⇒ m = 850∴ The MARKET price of the shirt is Rs.850.