Question:
A shopkeeper earns a profit of 12% on selling a book at 10% discount on the printed price. The ratio of the cost price and the printed price of the book is:

Option A):
45:51
Option B):
47:51
Option C):
45:56
Option D):
47:56

Correct Answer is Option C):
45:56

Explanation:
Let the CP be ₹ 100.
Hence, SP = 112
If the marked price be ₹ X, then
90% of x = 112
→ X = (112*100)/90 = Rs. 1120/9
Hence,
required ratio = 100:1120/9 = 900:1120 = 45:56.