Problems › JavaScript › logistics
Parcel discount band
A monthly contract discounts each parcel once the month's total reaches a threshold: every parcel from then on ships 15% cheaper.
- Ordinary rate applies below the threshold.
- A parcel is discounted once the running total, including it, has reached the threshold.
- The discounted rate is floor(cost × 85 / 100).
bulkDiscountBand(parcelCosts: list<int>, threshold: int) → int
Where you start
function bulkDiscountBand(parcelCosts, threshold) {
}Worked examples
| Call | Result |
|---|---|
bulkDiscountBand([100,100,100,100], 250) | 370 |
bulkDiscountBand([100,100], 200) | 185 |
bulkDiscountBand([100,100,100], 1000) | 300 |
bulkDiscountBand([], 0) | 0 |
Hint
Walk the values; once the running total crosses the threshold everything from that parcel on is discounted.
Reference solution in JavaScript
function bulkDiscountBand(parcelCosts, threshold) {
let total = 0, running = 0;
for (const cost of parcelCosts) {
running += cost;
total += running >= threshold ? Math.floor((cost * 85) / 100) : cost;
}
return total;
}