Ravi sells a chair to Mohan at a profit 10% and Mohan sells it to Govind at profit 20%. If Govind pays ₹1,320 for it. Then the cost price for Ravi is:

₹1,000

Let the cost price = 100

                 Ravi                Mohan                  Govind

CP             100----10%P----110------20%P----1320

The cost price for the Govind = 1320

132 = 1320 ( Given )

then 100 = 1000 ( Cost price for Ravi )

The marked price of the book = 900

Discount of 10% for two times is given.

Selling price = 900 × \(\frac{90}{100}\)  × \(\frac{90}{100}\)  = 729