Question

The marks in a test decreased from 40 to 30. The percentage decrease is-------

Answer 1

Answer:

25%

Step-by-step explanation:

According to the information provided in the question it is given as

Marks in test decreased from 40 to 30.

We need to find what is the  percentage decrease

First understand the percentage

Percentage can be calculated by dividing the value by the total value, and then multiplying the result by 100. The formula used to calculate percentage is: (value/total value)×100%.

Actual marks= 40

Decreased marks=30

Now finding decreased %

As We know

Decreased marks=(Actual marks- Decreased marks)

Substituting the values

=40-30

=10

Now find the marks decreased in %

Decreased%=Decreased marks / original marks x (100) %

Substituting the values we get answer

$=\frac{10}{40} \times 100\\= 0.25 \times 100\\= 25\%$

Hence the percentage decreased is 25%

Answer 2

Answer:-

25%

Step by step explanation:-

According to the information provided in the question it is given as

Marks in test decreased from 40 to 30.

We need to find what is the percentage decrease

First understand the percentage:-

Percentage can be calculated by dividing the value by the total value, and then multiplying the result by 100. The formula used to calculate percentage is: (value/total value)×100%.

Actual marks= 40

40Decreased marks=30

Now finding decreased %

As We know

Decreased marks=(Actual marks- Decreased marks)

Substituting the values

=40-30

=10

Now find the marks decreased in %

Decreased%=Decreased marks / original marks x (100) %

Substituting the values we get answer

30×100/40

=75%

100%-75%

=25%