A person mixes three varieties of wheat costing Rs. 20/- kg, Rs. 24/- kg and Rs. 30/- kg in the ratio of 1:5:2 and sells the mixture at a profit of 20%. Find the selling price of the mixture when it is sold at 33% profit:

A

Rs. 30/- kg

B

Rs. 33.25/- kg

C

Rs. 39.9/- kg

D

None of these