In a bag the coins of 1 Rs., 50 paise and 25 paise are in the ratio 3 : 8 : 12, If total amount in the bag is Rs. 440. If we add some coins of 1 Rs and 50 paise to maintain the ratio of 1 Rs., 50 paise and 25 paise in 1 : 1 : 1 then find the percentage increase in amount.