Q1:

Q1:
If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit,represented as I = 1000 {(1 + r/100)n – 1},and the annual interest rate is r percent,is r > 8 percent?
(1) The deposit earns a total of $210 in interest in the first 2 years.
(2) (1 + r/100)2 > 1.15
A.Statement (1) ALONE is sufficient,but statement (2) alone is not sufficient.
B.Statement (2) ALONE is sufficient,but statement (1) alone is not sufficient.
C.BOTH statements TOGETHER are sufficient,but NEITHER statement ALONE is sufficient.
D.EACH statement ALONE is sufficient.
E.Statements (1) and (2) TOGETHER are NOT sufficient.
我不明白（2）为什么能推出结论.
If n is a positive integer,what is the remainder when (74n + 3)(6n) is divided by 10
A.1
B.2
C.4
D.6
E.8
Q3:
A certain list consists of 3 different numbers.Does the median of the 3 numbers equal the average (arithmetic mean) of the 3 numbers?
(1) The range of the 3 numbers is equal to twice the difference between the greatest number and the median.
(2) The sum of the 3 numbers is equal to 3 times one of the numbers.
A.Statement (1) ALONE is sufficient,but statement (2) alone is not sufficient.
B.Statement (2) ALONE is sufficient,but statement (1) alone is not sufficient.
C.BOTH statements TOGETHER are sufficient,but NEITHER statement ALONE is sufficient.
D.EACH statement ALONE is sufficient.
E.Statements (1) and (2) TOGETHER are NOT sufficient
我不明白为什么（2）能推出结论.