1.  A reduction of 20% in the price of wheat enables a person to buy 3.5 kg more wheat for ₹ 770. The original price of rice is?

A. ₹ 55 per kg
B. ₹ 45 per kg
C. ₹ 65 per kg
D. ₹ 37 per kg
E. None of the above

Answer: Option A

Explanation:

Here, R = 20%, A = 3.5 kg and P = ₹ 770

According to the formula ,

Actual price of rice = [PR /(100 - R)] A

            = [(20 x 770) / (100 - 20)] x 3.5

            = [(20 x 770) / (80 x 3.5)

            = ₹55