Code an application so that it calculates and displays the number of gallons of water used and the total charge for water. the charge for the water is $1.75 per 1000 gallons or .00175 per gallon. Make the calculations only when the current meter reading is greater than or equal to the previous meter reading; other wise diplay an approiate message.Displya total charge with a dollar sign and two decimals. the text boxes should only accept numbers and th backspace key.Clear number of gallons used and the total charge when a change is made to contents. when a text box receives focus, select its exsisiting text.
I have attached the zip file of what I have so far