Find percentage of increase or decrease: -price of shirt decreased from rs 80 to rs 60. -marks in a test increased from 20 to 30. Share with your friends Share 1 Ankita Agarwal answered this Dear Student, a Price decreased = Rs80-60 = Rs 20%age decrease = 2080×100= 25%b Marks increased = 30-20= 10 marks%age increase = 1020×100= 50% Regards -1 View Full Answer