Write an R Program that asks the user to enter $5$ item prices, then calculate and display the sum, average, highest, and lowest item price. The program should also calculate and display the discount and total after discount based on the following criteria:

if the total price is less than $50$: discount $10\%$

total between $50$ and $100$: discount: $15\%$

total more than $100$: discount $20\%$