Happy Hour Discount Windows

Medium ⏱ 12 min 46% acceptance ★★★★☆ 4.3

Orders placed 15:00-18:59 get 30% off food (category 'food'), never beverages. Write bill(orders) where each order is (hour, category, amount): total the payable amount, applying the window discount to qualifying lines, 2-decimal rounded at the end.

Examples

Example 1

Input

bill([(16, 'food', 400), (16, 'beverage', 200), (20, 'food', 300)])

Output

780.0

Explanation

400 → 280 in the window; the rest full price.

Constraints

Window is 15 ≤ hour < 19.
Beverages never discount.

Topics

Business Logictime-based pricing

Companies

ZomatoDineoutHungerBox

Hints

Hint 1

A per-line multiplier expression works in a comprehension.

Hint 2

Round the sum once.

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