let initial amount = 100
9% discount = 9
remaining =91
14% discount = 14/100 x 91 =12.74
remaining =91-12.74 =78.26
therefore equivalent discount = 100-78.26 =21.74%
9% discount = 9
remaining =91
14% discount = 14/100 x 91 =12.74
remaining =91-12.74 =78.26
therefore equivalent discount = 100-78.26 =21.74%