generates list of gas prices with the number of gallons it would take to have an price and number of gallons with an integer

gas-prices-with-even-number.js

// price = price * 100 for simplicity
var str = ''
for (let price = 1; price <= 400; price++) {
  let gallons = 1
  while (gallons*price % 100 !== 0)
    gallons++
  str+=format(price, gallons, gallons*price)
}
function format(gasPrice, totalGallons, totalPrice) {
  return padRight(`Gas Price: ${currency(gasPrice)}`, ' ', 22) +
  padRight(`Total Gallons: ${padLeft(totalGallons, ' ', 3)}.00`, ' ', 22) +
  `Total Price: ${padLeft(currency(totalPrice), ' ', 7)}`+'\n'
}

console.log(str)
function currency(number) {
  return `$${number/100|0}.${padLeft(number%100, 0, 2)}`
}

function padRight(start, padding, padLength) {
  let str = ''+start
  while (str.length < padLength)
    str = str + padding
  return str
}
function padLeft(start, padding, padLength) {
  let str = ''+start
  while (str.length < padLength)
    str = padding + str 
  return str
}