After a mark-up of #40%# was added to an item a boy sells it for #Rs.35#. What was his cost price and how much was his mark-up?
The cost price is Rs.25 and the markup is Rs.10.
The important thing to note here is that you cannot just find 40% of Rs.35 and subtract it.
The boy's cost price represents 100%, onto which 40% is added to give Rs.35.
Therefore Rs.35 represents
Make an equation Let the cost price be