function DoMath(){

var Units = document.frmData.Units.value
var Rate = document.frmData.Rate.value
var Lamps = document.frmData.Lamps.value
var Total = ((Units - Rate) * Lamps)
document.frmData.Total.value = Total
var Kilowatt = Total/1000
document.frmData.Kilowatt.value = Kilowatt
var Hours = document.frmData.Hours.value
var Days = document.frmData.Days.value
var Week = document.frmData.Week.value
var Year = Kilowatt * Hours * Days * Week
document.frmData.Year.value = Year
var Energy = document.frmData.Energy.value
var Cost = Year * Energy
document.frmData.Cost.value = Cost
var Initial = document.frmData.Initial.value
var Simple = Initial/Cost
document.frmData.Simple.value = Simple
var Return = 100/Simple
document.frmData.Return.value = Return
}