Question

a sho0keeper mixed 34kg wt of sugar which costs 22.50 per kg wt with 29 kg wt of sugar which costs 15 per kg wt. at what rate must he sell the mixture so as to gain of 5% on the total investment

Answer 1

CP of 34 Kg sugar = 34 x 22.50 = 765 Rs
CP of 29 kg sugar = 29 x 15 =  435 Rs
​Total CP = 765+435 = 1200 Rs 
and total weight of sugar = 34 + 29 = 63 Kg

​Find SP on 5 % gain

SP = (100 + gain %)/100 x CP
​= (100 + 5)/100 x 1200 = 1260 Rs

Hence rate must sell the mixture so as to 5 % gain = SP/Total weight of sugar =
1260/63 = 20 Rs/per kg​ 

I hope it is helpful for you....