Payment method surcharge
Certain payment methods carry a surcharge. Look up the percentage and apply it to the subtotal.
- Rates in the map are basis points — hundredths of a percent.
- The surcharge is floor(subtotal × rate / 10000).
- An unknown method means no surcharge.
SurchargeByMethod(surchargeRates: map<string, int>, method: string, subtotal: int) → int
C# needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
public int SurchargeByMethod(Dictionary<string, int> surchargeRates, string method, int subtotal) {
}Worked examples
| Call | Result |
|---|---|
SurchargeByMethod(new Dictionary<string, int> { { "visa", 150 }, { "amex", 300 } }, "amex", 10000) | 300 |
SurchargeByMethod(new Dictionary<string, int> { { "visa", 150 } }, "paypal", 5000) | 0 |
SurchargeByMethod(new Dictionary<string, int> { { "visa", 150 } }, "visa", 8000) | 120 |
SurchargeByMethod(new Dictionary<string, int> { }, "visa", 1000) | 0 |
Hint
Map lookup, then a single integer division by ten thousand.
Reference solution in C#
public int SurchargeByMethod(Dictionary<string, int> surchargeRates, string method, int subtotal) {
int rate = surchargeRates.ContainsKey(method) ? surchargeRates[method] : 0;
return subtotal * rate / 10000;
}