ITPEC IP April 2025 Question 6
ITPEC IP April 2025 — Question 6 of 100
The tiered formula is option (b) — (units - 100) × 15 + 100 × 10 charges the first tier once and only the excess at the higher rate.
The else branch runs only when usage exceeds 100 units. The first 100 units cost 100 × $10 = $1,000. The remaining units - 100 units cost $15 each. Adding those parts gives (units - 100) × 15 + 100 × 10.
Answer (b)
Why not others:
- (a) reverses the two rates, charging the first 100 at $15 and the excess at $10
- (c) charges every unit at $15 and loses the lower first tier
- (d) charges every unit at $15 and then adds another $1,000, double-counting the initial units
Key rule: For progressive pricing, compute each completed tier plus the amount within the current tier.
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