# Daily Programmer 2 Easy
# Make a calculator, but make it specific to you.

def interest(a, b, c)
  sum = a.to_i * (b.to_i/100.0) * c.to_i
  total = sum + a.to_i

  puts "The interest on your investment is $#{sum}"
  puts "The total in the account is $#{total}"
end

print <<MENU
  This is an interest calculator. It takes your initial investment,
  your interest rate, and your length of the investment to then calculate
  the interest and the total you will have at the end of the period.

  Please enter a choice from the menu:
  '1' > Calculate interest!
  '2' > Quit
MENU

choice = gets.chomp

while (choice == '1' && choice != '2')
  puts "Please enter a starting investment (using a decimal since it's a monetary value, eg. 4000.00): "
  STDOUT.flush
  initial = gets.chomp

  puts "Please enter an interest rate as a percentage (20% = 20, 0.9% = 0.9, etc.): "
  STDOUT.flush
  rate = gets.chomp

  puts "Please enter an amount of time in months: "
  STDOUT.flush
  duration = gets.chomp

  interest(initial, rate, duration)

  puts "Shall you make another choice? "
  choice = gets.chomp
end


puts "Thank you for using the interest calculator."