ITPEC FE Subject B April 2024 Question 2

Determining when a discount condition applies using or vs and.

The discount price ($10) applies when any of these is true: age ≤ 10, age ≥ 60, or the passenger is a registered member. Since all three conditions independently qualify for the discount, they must be joined with or:

((age ≤ 10) or (age ≥ 60)) or isMember

Why not others:
- (a) `((age ≤ 10) and (age ≥ 60)) and isMember` — requires all three conditions simultaneously; age ≤ 10 and age ≥ 60 is logically impossible, so nobody ever gets the discount
- (b) `((age ≤ 10) and (age ≥ 60)) or isMember` — the age part is still impossible, so only members get the discount (children and seniors are excluded)
- (c) `((age ≤ 10) or (age ≥ 60)) and isMember` — age-based discount only works if the passenger is also a member; a non-member child or senior pays full price, which contradicts the problem

Key rule: when multiple independent conditions each qualify for the same outcome, connect them with or, not and.

AI-generated — may contain errors