I have this problem for my calculus project that I don't understand how to do, can someone help?

I have a hotel room that costs \$139.99 for one night and the hotel has 66 rooms. The problem says: The industry standard is commonly believe to be that for every \$10 increase in room rate, the hotel will sell one less room. Using this industry standard, do the following: A) calculate the current sales revenue (income from room sales) using the price you obtained and the number of rooms. B) determine, using the optimization process, the number of $10 room rate increases that will result in the maximum sales revenue. C) what is the new room rate? D) how many rooms will be sold. And E) what is their new maximum sales revenue (income from room sales).

I have a hotel room that costs \$139.99 for one night and the hotel has 66 rooms. The problem says: The industry standard is commonly believe to be that for every \$10 increase in room rate, the hotel will sell one less room. Using this industry standard, do the following: A) calculate the current sales revenue (income from room sales) using the price you obtained and the number of rooms. B) determine, using the optimization process, the number of $10 room rate increases that will result in the maximum sales revenue. C) what is the new room rate? D) how many rooms will be sold. And E) what is their new maximum sales revenue (income from room sales).

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