Hannah says that she believes this means that the company would be justified in raising the price of its product.

To be “justified” (justified) means to be reasonable or to be able to be explained.

You might feel justified in going to the movies this weekend because you worked hard all week.

When Hannah says that the company would be justified in raising the price of the product, she means that the company should increase, or raise the price and that there's no reason not raise the price.

It would be “justifiable,” or able to be “justified” - you can come up with a good reason why you should do something.

Finally, Hannah says that the company should use the additional revenue to improve the product's features.

“Revenue” (revenue) is income.

It's the money that a person or an organization receives (or gets) from selling something.

If you are selling cars and you sell 10 cars, and each car costs $10,000, you will have $100,000 in revenue.

Vision Corporation will receive more revenue, or income, if it increases the price of its product and if the same number of people buy the product.

Of course, sometimes if you increase the price, fewer people will buy your product, so you may or may not get more revenue.