Let cost price of MI pro and Honor 7x be Rs. 100x and Rs. 100y respectively. Total profit on MI pro =100x×(30÷100)=30x Total profit on Honor 7x=100y×(7x=75:100=3:4 So,(100x+30x):(100y+20y)=3:4 13x=9y 13x−9y=0.....(ii) From (i) & (ii) x = 225 Rs. & y = 325 Rs Total discount allow by mobile shop owner, if he would sold MI pro at 10% discount and Honor 7x at 15%