单选题
【正确答案】
C
【答案解析】Let P = the price of the TV set. Then Jack paid 1.085(.90P), whereas Jill paid .90(1.085P). The columns are equal (C).
**Use TACTIC 2, Chapter 12, and choose a convenient number: assume the TV cost $100. Jack paid $90 plus $7.65 tax (8.5% of $90) for a total of $97.65. Jill's cashier rang up $100 plus $8.50 tax and then deducted $10.85 (10% of $108.50) for a final cost of $97.65.
**Use TACTIC 2, Chapter 12, and choose a convenient number: assume the TV cost $100. Jack paid $90 plus $7.65 tax (8.5% of $90) for a total of $97.65. Jill's cashier rang up $100 plus $8.50 tax and then deducted $10.85 (10% of $108.50) for a final cost of $97.65.
【正确答案】
B
【答案解析】Since A times ABA is a three-digit number, A has to be less than 4; but 1 times ABA is ABA, so A ≠ 1. Therefore, A = 2 or A = 3.
[*]
Since there is no carrying, either 2 × B = C, a one-digit number, and B ＜ 5, or 3 × B = C, and B ＜ 3. In either case, column B is greater.
[*]
Since there is no carrying, either 2 × B = C, a one-digit number, and B ＜ 5, or 3 × B = C, and B ＜ 3. In either case, column B is greater.