var SPENDING_LIMIT = 500;
var SALES_TAX = 0.09;
var PHONE = 120;
var ACCESSORY = 20;

var available_funds = 1000.01;
var cost = 0;


var SPENDING_LIMIT = 500;
var SALES_TAX = 0.09;
var PHONE = 120;
var ACCESSORY = 20;

var available_funds = 1000.01;
var cost = 0;

// purchase of phones while funds are still avail
    // if there are funds to buy accessories

// need to incorporate sales tax

// checks if the phone is affordable; enough money in avaialable funds

add variables and constants to phone purchase