Question

Find the percentage of increase or decrease marks in a test increased from 20 to 30

Answer 1

Answer:

increase of 50% & decrease of 33 1/3%

Step-by-step explanation:

No. of marks increased = 30 - 20

= 10

what percentage is 10 of 20

= 10 / 20 % or 10 / 20 * 100

= 1 / 2 * 100 ( after cancellation of common zeros )

= 50 %

Therefore , increase is of 50 %

No. of marks decrease = 30 - 20

= 10

what percentage is 10 of 30

= 10 / 30 % or 10 / 30 * 100

= 1 / 3 of 100 ( after cancellation of common zeros )

= 33 1/3 %

Therefore , decrease was of 33 1/3 %