During the synthesis stage of the cell cycle, a cell makes (replicates its own) DNA.
Economic profits equals total revenues minus the sum of explicit costs and implicit costs. Since explicit costs are already subtracted when arriving at the accounting profit, we can find economic profit by subtracting the implicit costs from the accounting profit.
Economic profit is the difference between total monetary revenue and total costs, but total costs include both explicit and implicit costs. Economic profit includes the opportunity costs associated with production and is therefore lower than accounting profit.