Explanation:

Given, Manideep purchases 30kg of barley at the rate of 11.50/kg nad 20kg at the rate of 14.25/kg.

Total cost of the mixture of barley = (30 x 11.50) + (20 x 14.25)

= Total cost of the mixture = Rs. 630

Total kgs of the mixture = 30 + 20 = 50kg

Cost of mixture/kg = 630/50 = 12.6/kg

To make 30% of profit

= Selling price for manideep = 12.6 + 30% x 12.6

= Selling price for manideep = 12.6 + 3.78 = 16.38/kg.

Hence, option 4 is the correct answer.