Question on Oracle Sql & Pl ((Note: is Oracle Sql, not MYSQL))

Here are the questions. I did the homework. Just check my work under "My Work" (see below / scroll down) and tutor me on any problems (if you find any). If not, just gives my work a thumbs up if it looks good

EXERCISE 1 _Write a SELECT statement that returns these columns from the Products table:

The list_price column

A column that uses the TO_CHAR function to return the list_price column with currency formatting

EXERCISE 2 _Write a SELECT statement that returns these columns from the Products table:

The date_added column

A column that uses the CAST function to return the date_added column as VARCHAR2 data type with 9 characters the

EXERCISE 3 _Write a SELECT statement that returns these columns from the Products table:

The list_price column

The discount_percent column

A column named discount_amount that uses the previous two columns to calculate the discount amount and uses the ROUND function to round the result so it has 2 decimal digits 

My Work:

-- Ex 1

select list_price, to_char(list_price, '9,999,999.99') AS "list_price_with_currency_formatting"

from products

-- Ex 2

SELECT date_added, CAST(date_added as varchar(10)) AS date_added_as_varchar2_date_type 

FROM products

-- Ex 3

SELECT list_price, 

discount_percent, 

ROUND(((list_price * discount_percent) / 100), 2) AS discount_amount 

FROM products 

(where possible test these queries yourself to evaluate their accuracy, and compare them to the exercise requirements to verify their accuracy)