In each of the following questions, a question is followed by information given in three statements. You have to study the question along with the statement and decide the information given in which of the statements is necessary to answer the question. What is the cost of fencing a rectangular plot? Statement I: The length of the plot is thrice its breadth. Statement II: The cost of fencing is Rs. 16 per metre. Statement III: Ratio between breadth and length of the plot is 1 : 3.