The average bedroom in an apartment is approximately 16'x10' with an eight-foot ceiling. As an interior decorator that loves the 1970s decor, you need to cover the walls with a groovy flowered wallpaper.

Part A: If one roll of wallpaper covers 50ft^2, then determine how many rolls of groovy wallpaper is needed to cover the apartment bedroom.

Part B: If one roll of wallpaper costs $15.90, then determine the cost to re-wallpaper the apartment room.

A. 9 rolls

B. 143.10

Step-by-step explanation:

Based on the question, we have to assume there are no windows and no doors in that bedroom ... to calculate how much less wallpaper we really need, and we cover completely from the floor to the ceiling.

A. If one rolls covers 50 sq ft, how many rolls do we need?

First, let's calculate the perimeter of that room, which is 16'x10'.

P = 16 + 10 + 16 + 10 = 52 feet of perimeter.

Now, the walls are 8 feet high ... so, let's see just how big is the area to cover.

A = 52 feet * 8 feet = 416 sq feet to cover all walls.

Since we know each roll covers 50 sq ft, we will need:

416 / 50 = 8.32 rolls.

When talking about quantity you need to buy or to fill something, you always have to round up to the next unit. Because you usually can't buy a portion of a unit and if you round it down, you'll miss material to cover your walls.

So, we will need 9 rolls.

B. Total cost, based on $15.90 per roll.

We already know we need 9 rolls ... so how much will it cost us?

C = 9 * $15.90 = $143.10