Function to calculate how much gross do you need to reach a net target.

calculateInvoice.js

/**
 * calculateInvoice is a function to calculate how much gross do you need to reach a net target.
 * 
 * @param netTarget The net you want to receive.
 * @param taxPercent The tax percentage normally practiced for company segment and government.
 * @returns Object which includes the: tax, net and gross results.
 */
function calculateInvoice(netTarget, taxPercent) {
    for (let gross = netTarget; gross < (netTarget*1000); gross++) {
        const tax = (gross*taxPercent)/100;
        const net = gross-tax;

        if (net >= netTarget) {
            return { netTarget, tax, net, gross };
        }
    }
}