Merhaba arkada$$lar$,$

Save the codes of the questions below, the outputs on the screen after running them in a PowerPoint file, give your name and last name to your project and upload them to the TEAMS system. Deadline: $14\mathrm{.}06\mathrm{.}2024.$ This project is not mandatory. It is optional.

QUESTIONS

$1-$ A class has $20$ students. Get the students' grades by user using array variable. After the grades are entered, write the code of the program that finds the class average, the highest and lowest grades in the class and displays it on the screen.

$2-$ Create a list data type of colors. Initially set the list as $7$ colors.

a$)$ Print the elements of this list to the screen.

b$)$ Print the $6$th element of this list to the screen.

c$)$ Add two new colors to this list.

d$)$ Add a new color after the $5$th element of this list.

e$)$ Delete the $4$th element from this array.

f$)$ Look for the "red" element in the list.

$3-$ Write a program that generates as many random numbers as the number entered from the keyboard and then displays the numbers between $1-99$ and $1-9$ separately.

$4-$ The program provides the program design for a market, depending on the user's choice. Categories consist of Food, Cleaning and Fruits$/$Vegetables$.$ Determine the stock quantity and price of $5$ products for each category. Calculate the payment of the products to be purchased by the customer and the remaining stock quantities using methods. Use methods with and without parameters, with and without return values. You can design the program as you wish.

Example output:

Food $(1)$

Cleaning Material $(2)$

Fruit$/$Vegetable $(3)$

Payment $(4)$

Exit $(5)$

Use C# language please for all four questions