What ratio must a shopkeeper mix Peas and Soybean of Rs.16 and Rs. 25/kg, As to obtain a mixture of Rs.21?  Choose the correct choice from the following answers.
A) 10 : 7	B) 9 : 8	C) 4 : 5	D) 13 : 11	E) 14 : 8

Rationale: "correct option : ( c ) use rule of alligation , to determine the ratio the required ratio of soybean and peas = 4 : 5"
Answer: C