If the base of a rectangle is increased by 10% and area is unchanged, then what would be the change in its altitude?

Question

The altitude of a circular cylinder is increased 12 times and the base area is decreased to one ninth of its value.
How much would be the change in surface area of new cylinder?

Answer 1

New altitude will be in the ratio 1/1.1 ie altitude will be reduced 9.1% of the original altitude

Answer 2

the altitude will be 1/1.1 th of the original i.e. approximately 90.90909% of original