Write a program that compares a list price and an actual price. Your program should print a single message. If the actual price is less than $50\%$ of the list price, print $$Great deal$.$ Otherwise, if the actual price is less than $80\%$ of the list price, print $$Good deal$.$ If that is not the case but the actual price is no more than the list price, print $$Ok deal$.$ If none of these apply, print $$Bad deal$.$