In cost accounting, a cost sheet is a statement that shows the various elements of cost related to a product for a specific period or quantity.
When the cost sheet is prepared using actual figures of past costs, it is called a Historical Cost Sheet.
But when the figures are not actual but are based on forecasts and estimates for future production, it is called an Estimated Cost Sheet.
An Estimated Cost Sheet helps management plan for the future by giving an idea about expected costs and profits.
It is prepared before starting production, so that pricing, budgeting, and cost control measures can be planned in advance.
Therefore, the correct answer is Estimated Cost Sheet.