Explanation

Statement (1)

If John saved an average of $50 per month for the first and last months, then he saved a total of $100 in those months, and his savings in the second month must be $100. This statement is sufficient.

The correct answer would be between A/D.

Statement (2)

If John saved x in the second and third months combined, then his savings in three months is (2/3)*x* + *x* = (5/3)*x* = 200. We can solve for *x*, the amount he saved in months two and three overall, but we don't know how much he saved in month two versus month three. This statement is insufficient.

**The correct choice is A.**

If John saved an average of $50 per month for the first and last months, then he saved a total of $100 in those months, and his savings in the second month must be $100. This statement is sufficient.

The correct answer would be between A/D.

Statement (2)

If John saved x in the second and third months combined, then his savings in three months is (2/3)