Question

The radius and height of a cylinder are increased by 12% and 17% respectively. find the percentage increase in its curved surface area ?

Answer 1

explained in pic clearly

Answer 2

31.04% is the answer

C.S.A = 2*Pi* r * h

New radius = r+12% of r = 1.12r
New height = h + 17% of h = 1.17 h
New C.S.A = 1.12*1.17*C.S.A

% increase in C.S.A = (1.12*1.17 - 1) * 100 % =31.04 %