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The highest energy level in an atom corresponds to n = 1.
Amount Owing
The total sum of money that is due to be paid.
Operating Expense
An ongoing expense incurred in the operation of a business, such as rent, utilities, and salaries.
Operating Profit
Earnings before interest and taxes, calculated by subtracting operating expenses from gross profit.
Mark-up
The difference between the cost of a good or service and its selling price, expressed as a percentage over the cost.
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