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Converts decimal hours (e.g., 2.75 hours) to hours and minutes (2h 45m), or vice versa. Decimal hours are used in payroll systems and billing; hours:minutes is what clocks display. Mixing them up is a common payroll error.

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1. 1Decimal to h:mm: integer = hours, decimal × 60 = minutes
2. 2h:mm to decimal: hours + minutes/60
3. 32.75 hours = 2h + (0.75 × 60)m = 2h 45m
4. 42h 45m = 2 + 45/60 = 2 + 0.75 = 2.75 hours

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