PlatformGold price calculation formulas

priceCalc.js

/**
 *
 * Plain English: 
 * If disablePerOzCalc is TRUE, price = (metalWeight x metalSpot) + premium
 * Otherwise, price = metalWeight x (metalSpot + premium)
 *
 * @param metalSpot
 * @param premium
 * @param metalWeight
 * @param disablePerOzCalc
 * @returns {number}
 */
function calculateDollarPremiumPrice(metalSpot, premium, metalWeight, disablePerOzCalc) {
    return (disablePerOzCalc) ? (metalWeight * metalSpot) + premium : metalWeight * (metalSpot + premium);
}

/**
 * Plain English:
 * metalWeight x metalSpot x (1 + (premium / 100))
 * 
 * @param metalSpot
 * @param premium
 * @param metalWeight
 * @returns {number}
 */
function calculatePercentPremiumPrice(metalSpot, premium, metalWeight) {
    return metalWeight * metalSpot * (1 + (premium / 100));
}

module.exports = {
    calculateDollarPremiumPrice,
    calculatePercentPremiumPrice
}