平成24年度 春期 ITパスポート試験 問90

※ Our check while writing this explanation could not fully confirm the published answer; scoring follows IPA's official key.

• ×Incorrectア

  The course fee of 7,200 yen is correct: rule (2) applies to Oyo Jiro, so with 10% off, Course Q comes to 8,000 × 0.9 = 7,200 yen. However, the textbook fee of 1,800 yen is wrong. Premise (5) states explicitly that no discount is applied to the textbook fee, so the 2,000 yen textbook fee listed for Course Q in Table 1 is billed as it is. 1,800 yen is 2,000 × 0.9 — the typical mistake of applying the 10% discount meant for the course fee to the textbook fee as well. Overlooking the condition that only the course fee is discounted leads to this choice.

• ○イ

  正解 The correct answer is イ, “For Oyo Jiro's Course R, the course fee is 18,000 yen and there is no textbook fee charged.” Organizing the premises of the section, there are three discount rules for the course fee: (1) an applicant in the member category gets 10% off the course fee; (2) when the same applicant is billed for several courses that start in the same month, each of those course fees gets 10% off; (3) when both (1) and (2) apply, each of those course fees gets 20% off. No discount is applied to the textbook fee. Also, in the training course table (Table 1), Course R starts on September 25, its course fee is 20,000 yen, and no textbook fee is charged; Course Q starts on September 17, its course fee is 8,000 yen, and its textbook fee is 2,000 yen. From [Training course attendance] (1), Oyo Jiro is in the general category (not a member), so rule (1) does not apply to him. On the other hand, from (3) he took two courses, Course Q (starting September 17) and Course R (starting September 25); both start in September, so he is billed for several courses that start in the same month and rule (2) applies. Since rule (1) does not apply and only rule (2) does, rule (3) does not apply either, so the discount rate is 10%. The course fee for Course R is therefore 20,000 × 0.9 = 18,000 yen, which matches the amount in choice イ. As for the textbook fee, not only is no discount applied to it, but Table 1 specifies from the start that no textbook fee is charged for Course R. Both parts of the statement — a course fee of 18,000 yen and no textbook fee charged — are thus correct, so イ is appropriate.

• ×Incorrectウ

  Shiken Hanako is a member, so rule (1) applies: the course fee for Course P is the 10,000 yen in Table 1 with 10% off, that is 9,000 yen, and since the textbook fee is not subject to any discount it stays at the 2,000 yen listed in Table 1. In ウ the textbook fee of 2,000 yen is correct, but the course fee is not 9,000 yen, so the statement is wrong. Shiken Hanako took Course P (starting September 4) and Course S (starting October 2), so the start months are split between September and October; she therefore does not meet the condition in rule (2) of several courses starting in the same month, and rule (3) with its 20% discount, which requires both (1) and (2), does not apply either. Judging rule (2) by the month a course starts rather than by the month of application, and not applying the 20% discount by mistake, are what separate the right answer from the wrong ones.

• ×Incorrectエ

  The course fee for Course S should be 13,500 yen — the 15,000 yen in Table 1 with the 10% member discount of rule (1) applied — and the fee in エ does not match it, so the statement is wrong. The textbook fee of 1,500 yen matches Table 1 and is correct. Because Course P and Course S start in different months, Shiken Hanako does not meet rule (2); but as long as she is a member, the 10% discount of rule (1) always applies, so the list price is never billed as it is. Jumping to the conclusion that there is no discount at all the moment you find rule (2) unusable leads to this wrong choice.