Simple interest on a certain sum at a certain annual rate of interest is 1/3 of the sum. If the numbers representing Time is three times the Rate percent , then the Rate is:	Choices:  A) 1 1/3 %.  B) 2 1/3 %.  C) 3 1/3 %.  D) 4 1/3 %.  E) 5 1/3 %.
Explanation :   Let sum = x. Then, S.I. = x/3   Let N =3R   [x * 3R * R / 100] = x/3? R^2 = 100/9   R = 10/3 = 3 1/3%.   Hence, Rate = 3 1/3 %.   Answer : 3 1/3 %.
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Simple interest on a certain sum at a certain annual rate of interest is 1/3 of the sum. If the numbers representing Time is three times the Rate percent , then the Rate is: