Question

Marks in a test increased from 20 to 30 find the percentage of increase

Answer 1

Answer:

50%

Step-by-step explanation:

initial marks:20

marks after increase:30

marks increased:30-20=10

let percentage of increase be x.

then,

x% of 20=10

(x÷100)×20=10

x=(10÷20)×100=100÷2=50

the percentage of increase is 50%.

Answer 2

Answer:

30-20=10

x of 30=10

(x÷100)×20=10

x=(10÷20)×200

100÷2

=50