Question

the side of a square is increased from 20cm to 21cm .calculate the percentage increase in its area ​

Answer 1

Answer:

=20×21/100

=420/100

=4.2%increase

Answer 2

Answer:

old area = 20^2 = 400

new area = 21^2 = 441

% increase in area =41/400×100/1=10.25%