### Instruction: What is the principal sum?
I. The sum amounts to Rs. 720 in 4 years at S.I.
II. The sum amounts to Rs. 810 in 7 years at S.I.
III. The rate of interest is 10% p.a.
Answer Choices: (A) I and III only (B) II and III only (C) I and II only (D) Any one of the three (E) Any two of the above.### Response: Let's reason about the multi-choice question.
Clearly, any of the three will give us the answer
The answer is E