/**
 * Adds multiple numbers with high precision using Big.js
 * @param numbers - Array of numbers to add
 * @returns The sum as a number
 */
export declare function Add(...numbers: number[]): number;
/**
 * Subtracts multiple numbers with high precision using Big.js
 * @param numbers - Array of numbers where the first is subtracted by all others
 * @returns The subtraction result as a number
 */
export declare function Subtract(...numbers: number[]): number;
/**
 * Multiplies multiple numbers with high precision using Big.js
 * @param numbers - Array of numbers to multiply
 * @returns The product as a number
 */
export declare function Multiply(...numbers: number[]): number;
/**
 * Divides multiple numbers with high precision using Big.js
 * @param numbers - Array of numbers where the first is divided by all others
 * @returns The division result as a number
 */
export declare function Divide(...numbers: number[]): number;
/**
 * Calculates discounted or marked-up price based on a percentage
 * @param originalPrice - The starting price
 * @param discountPercentage - Percentage to apply (discount or markup)
 * @param markUp - When true, adds the percentage; when false, subtracts it
 * @returns The final price after discount/markup as a number
 */
export declare function CalcDiscPrice(originalPrice: number, discountPercentage: number, markUp?: boolean): number;
/**
 * Calculates a price with markup applied
 * @param originalPrice - The starting price
 * @param markupPercentage - Percentage to mark up by
 * @returns The final marked-up price as a number
 */
export declare function CalcMarkup(originalPrice: number, markupPercentage: number): number;
/**
 * Calculates a price with markdown (discount) applied
 * @param originalPrice - The starting price
 * @param markdownPercentage - Percentage to mark down by
 * @returns The final marked-down price as a number
 */
export declare function CalcMarkdown(originalPrice: number, markdownPercentage: number): number;
/**
 * Calculates the margin value as a percentage based on price and cost
 * @param price - The selling price of the item
 * @param cost - The cost of the item
 * @returns The margin value as a percentage
 */
export declare function GetMarginValue(price: number, cost: number): number;