Calculate Dasher Pay with Multi Order Rate

You are in charge of implementing the Dasher payment model. The first version of the payment model is naively based on how much time a Dasher spends on each order. Given the sequence of accepted/fulfilled order activities from a given Dasher on a given day, calculate the Dasher pay based on the following payment rules: Base pay rate: $0.3 per minute Multi-order pay rate: ongoing deliveries * base pay rate (when Dasher is delivering multiple orders at the same time) Assumptions: All order activities are from the same calendar day Order activity sequence is valid; all orders are fulfilled by end of day (no duplicates, no fulfillment without pickup, no pickup without fulfillment, etc). Example: Input: 06:15: Dx accepted order A 06:18: Dx accepted order B 06:36: Dx fulfilled order A 06:45: Dx fulfilled order B Output: final pay: $14.4 Explanation: 06:15 - 06:18 -> pay = 3 * 0.3 -> $0.9 06:18 - 06:36 -> pay = 2 orders * 0.3 * 18 -> $10.8 06:36 - 06:45 -> pay = 0.3 * 9 = $2.7 Example Input 06:15: Dx accepted order A 06:18: Dx accepted order B 06:36: Dx fulfilled order A 06:45: Dx fulfilled order B