Old price: p1 = $ 3.90;

New price: p2 = $ 3.40.

The percentual decrease is given by

d(%) = [ (p2 - p1) / p1 ] * 100 %

d(%) = [ (3.40 - 3.90) / 3.90 ] * 100 %

d(%) = [ - 0.50 / 3.90 ] * 100 %

d(%) = - 0.128 * 100 %

d(%) = - 12.8 % (approximately)

So the price fell 12.8 % approximately.

I hope this helps. =)

4 0

2 years ago

A rectangle is 36 inches x 48 inches.<br><br> what is the perimeter.?<br><br> what is its area.?

olga nikolaevna [1]

For area, just multiply the length x width
So therefore, multiply 36 inches x 48 inches and there you have it.

Now for the perimeter, it is a little different
You'd have to add the sides up together to get your answer for the perimeter.
So, 36 in + 36 in + 48 in + 48 in = answer

3 0

2 years ago

Read 2 more answers

All athletes at the Olympic games are tested for performance-enhancing steroid drug use. The imperfect test gives positive resul

Nana76 [90]

Answer:

0.4%

Step-by-step explanation:

We have two independent events

The athlete who is being tested for drugs actually is using steroids.
The test went wrong indicating a false result.

The probability of 1) to happen is 0.04 because "4% of all registered athletes use steroids".

The probability of 2) ti happen is 0.1 because "The imperfect test gives positive results (indicating drug use) for 90% of all steroid-users"

Then the probability of 1) and 2) to happen is given by

$P=P(1)*P(2)=(0.04)(0.1)=0.004$ =0.4%

3 0

3 years ago

What is a proportion

jeka57 [31]

A proportion is two ratios equivalent to each other

7 0

2 years ago