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#prompt the user to enter the price
puts "Enter the sale price "
price = gets.chomp
total = 0

while price != "done"
  price = price.to_f
  total = total + price
  puts "subtotal : $#{total}"
  puts "Enter the sale price"
  price = gets.chomp
end
   puts "The amount due is: $#{total}"
   amount_due = total
    #Enter the amount tendered
  puts "Enter amount tendered >> "
  amount_tend = gets.chomp.to_f
  # calculate and output the change due
  change_due = amount_tend - amount_due
  # check if the amount from user is not less than the amount due,
  #if it is display the amount due and quit the program.
if amount_tend < amount_due
    amount_due =  amount_due - amount_tend
    puts "You still owe me $#{amount_due}"
  #diplay message and total change after due amount is paid off.
else
  puts "========Thank You!===============!"
  puts "The total change due is $#{change_due}"
  puts ""
  puts Time.now.strftime("%H:%M%p %m/%d/%Y")
  puts "=================================="
end