What ratio must a shopkeeper mix Peas and Soybean of Rs.16 and Rs. 25/kg, As to obtain a mixture of Rs.21.50 ? Pick one:
A) 10 : 7
B) 9 : 8
C) 7 : 11
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 = 3.50 : 5.50 = 7 : 11"
Answer: C