A shopkeeper earns a profit of 22% after selling a book at a 22% discount on printed price. Find the ratio of CP: MRP.

39:61

Let the printed price = 100

Discount% = \(\frac{Discount}{100}\) x 100

22 = \(\frac{D}{100}\) x 100

D = 22

SP = 100 - 22 = 78

Similarly, Profit% = \(\frac{78 - CP}{CP}\) x 100

22 = \(\frac{78 - CP}{CP}\) X 100

CP = \(\frac{7800}{122}\)

CP : MRP = \(\frac{7800}{122}\) : 100 = 78 : 122 = 39 : 61