1.  Due to a 25% increase in the price of rice per kilogram, a person is able to purchase 20 kg less for ₹ 400. What is the increased price of rice per kilogram?
A. ₹ 5
B. ₹ 6
C. ₹ 10
D. ₹ 4

Answer: Option A

Explanation:

Increase in the price of rice = 25%

 Increased in ₹ 400 = 25% of ₹ 400

      = 400 x (25/100) = ₹100

 Increased in rate of rice in 25%, there are 20kg less rice in ₹ 400 i.e., rate of 20 kg rice

 = ₹ 100

 = Rate of 1kg rice = 100/20 = ₹ 5

 Increased price of rice = ₹ 5 per kg