Question

Krishna sells a book for Rs 180 at a loss of Rs 10%. Find the cost price of the book...

Answer 1

CP = 100/100-loss%*SP
CP = 100/100-10*180
CP = 100/90*180
CP = 100*2
CP = 200 Rupees

Answer 2

Let the cost price be x.
Then,
x - 10%x = 180
90%x = 180
Therefore,
x = 200
Therefore, cost price of the book is 200/-
Hope this helps you.