Question

a grocer brought suger worth of Rs 4500. he sold one-third of it at a gain of 10%. at what gain per cent must the remaining suger be sold to have a gain of 12% on the whole

Answer 1

Assume he bought 3kg at 4500 Rs.
1/3rd sold at 10% profit
1 kg sold at 10% profit
C.P of 1 kg =1500
S.P = 1500*110/100 =1650 Rs.
 Total profit to be earned = 12%
Total SP = 4500*112/100=5040 Rs.
So S.P of remaining 2 kg =  5040-1650 =3390
C.P of 2 kg =3000
P% = 390/3000 * 100 = 13%
So, the remaining 2/3rd part should be sold at 13% profit.