/**
 * Perform financially accurate multiplication
 */
export declare function multiply(a: number | string, b: number | string): number;
/**
 * Perform financially accurate addition
 */
export declare function add(a: number | string, b: number | string): number;
/**
 * Perform financially accurate subtraction
 */
export declare function subtract(a: number | string, b: number | string): number;
/**
 * Perform financially accurate division
 */
export declare function divide(a: number | string, b: number | string): number;
/**
 * Calculate percentage
 */
export declare function percentage(value: number | string, percent: number | string): number;
/**
 * Round to specified number of decimal places
 */
export declare function round(value: number | string, decimalPlaces?: number): number;
/**
 * Calculate basic billing
 * Supports quantity * price with proper decimal precision
 */
export declare function calculateBasicBilling(quantity: number | string, price: number | string): number;
/**
 * Calculate tiered billing (simplified version)
 * This assumes a simple tiering structure where the entire quantity is billed at
 * the appropriate tier rate based on the quantity.
 *
 * @param quantity - The quantity to bill
 * @param tiers - Array of {threshold, rate} objects, sorted by threshold ascending
 */
export declare function calculateTieredBilling(quantity: number | string, tiers: Array<{
    threshold: number;
    rate: number;
}>): number;
/**
 * Calculate graduated tiered billing
 * This calculates billing where each tier applies only to the quantity
 * within that tier's range.
 *
 * @param quantity - The quantity to bill
 * @param tiers - Array of {min, max, rate} objects, sorted by min ascending
 */
export declare function calculateGraduatedBilling(quantity: number | string, tiers: Array<{
    min: number;
    max: number | null;
    rate: number;
}>): number;