Question

a shopkeeper bought locks at the rate of 8 locks for rupees 34 and sold them at the rate 12 locks for rupees57 .find his gain percent and the number of locks he should sell to earn a profit of rupees45

Answer 1

cp of 1 lock=4.25rs

sp of 1 lock=4.75rs

profit on 1 lock=0.5rs

to get profit of 45 rs,no of locks to be sold is =45/(0.5)=90

no of locks to be sold is 90