Dasher Payment Model - Calculate Dasher Earnings per Delivery

Question

## Round 1 - Coding

## Problem

Implement DoorDash's dasher payment calculation. A dasher earns a base pay per delivery plus a per-mile bonus, and may receive a peak-hour boost. Tips are passed through separately. Implement the payment model with configurable parameters.

```python
@dataclass
class DeliveryDetails:
    distance_miles: float
    duration_minutes: float
    is_peak_hour: bool
    customer_tip: float
    order_value: float

@dataclass
class PayModel:
    base_pay: float           # e.g. 2.00
    per_mile_rate: float      # e.g. 0.50
    peak_multiplier: float    # e.g. 1.25
    min_guarantee: float      # minimum pay before tip

class DasherPayCalculator:
    def __init__(self, model: PayModel): ...

def calculate(
        self,
        delivery: DeliveryDetails
    ) -> dict:
        # Returns:
        # {"base": float, "mileage": float, "peak_bonus": float,
        #  "tip": float, "total": float}
        ...
```

```
Example:
model = PayModel(base_pay=2.00, per_mile_rate=0.50, peak_multiplier=1.25, min_guarantee=3.00)
calc = DasherPayCalculator(model)
calc.calculate(DeliveryDetails(distance_miles=3.0, duration_minutes=20,
                               is_peak_hour=True, customer_tip=4.00, order_value=25.0))
-> {"base": 2.00, "mileage": 1.50, "peak_bonus": 0.875, "tip": 4.00, "total": 8.375}
```

## Follow-ups

1. How does the minimum guarantee interact with peak bonuses?
2. How would you add a promotion (e.g. extra $2 for completing 5 deliveries this hour)?
3. How would you generate a weekly pay stub from a list of `DeliveryDetails`?
4. What tax implications change the net take-home, and how would you model those?

Dasher Payment Model - Calculate Dasher Earnings per Delivery

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