freelancer-rates.js

// @ts-check

/**
 * The day rate, given a rate per hour
 *
 * @param {number} ratePerHour
 * @returns {number} the rate per day
 */

 export function dayRate(ratePerHour) {
    return ratePerHour * 8;
  }
  
  /**
   * Calculates the number of days in a budget, rounded down
   *
   * @param {number} budget: the total budget
   * @param {number} ratePerHour: the rate per hour
   * @returns {number} the number of days
   */
  export function daysInBudget(budget, ratePerHour) {
    const dR = dayRate(ratePerHour);
    return Math.floor(budget / dR);
  }
  
  /**
   * Calculates the discounted rate for large projects, rounded up
   *
   * @param {number} ratePerHour
   * @param {number} numDays: number of days the project spans
   * @param {number} discount: for example 20% written as 0.2
   * @returns {number} the rounded up discounted rate
   */
  export function priceWithMonthlyDiscount(ratePerHour, numDays, discount) {
    let discountedMonthsPrice = ((Math.floor(numDays/22)*22)*dayRate(ratePerHour)) * (1 - discount);
    const remainingDaysPrice =  numDays%22 * dayRate(ratePerHour);
    
    return Math.ceil(discountedMonthsPrice + remainingDaysPrice);
  }