{"blocks": [{"key": "8dacaf10", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "7176c11e", "text": "Design a delivery driver salary system supporting: Add_driver(driver_id, usd_hourly_rate), Record_delivery(driver_id, start_time, end_time), Get_Total_Cost(), Pay_Up_To(pay_time), and Total_Cost_Unpaid(). Explain data structures, state-mutation logic, and object-oriented design for accurate, efficient payroll computation.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}