Step 1: Make a note of the given information

Given that, the radius of cylinder(r) required is = 7 cm

height (h) = 35 cm.

Step 2: Recall the formula for surface area of cylinder

Surface area of cylinder = 2 \pi r h

= 2 * \frac{22}{7} * 7 * 35

= 1540 cm^2

Step 3: Find the required paper sheets for 100 such cylinders.

Required sheet to prepare one cylinder = 1540 cm^2

Required paper sheets for 100 such cylinders = 100 * 1540

= 154000 cm^2