Given- Inner radius-3.25cm, thickness- 0.25cm
So, outer radius=inner radius+thickness
=3.25+0.25=3.5 cm.
Now, outer curved surface area of hemispherical bowl=2πr²
=2×22/7×3.5×3.5
=44×1.75
=77cm², so option 'B' is correct

The outer curved surface area of the hemispherical bowl can be calculated by finding the difference between the surface areas of the outer and inner surfaces of the bowl.

To find the surface area of the outer surface of the bowl, we need to consider the curved surface area of the hemisphere plus the area of the ring-shaped region formed by the thickness of the steel.

1. Surface Area of the Outer Surface:
The curved surface area of a hemisphere is given by the formula:
A = 2πr²
where r is the radius of the hemisphere.

In this case, the radius of the outer surface is the sum of the inner radius and the thickness of the steel:
r_outer = r_inner + thickness
= 3.25 cm + 0.25 cm
= 3.5 cm

So, the surface area of the outer surface is:
A_outer = 2πr_outer²
= 2π(3.5)²
= 2π(12.25)
= 24.5π cm²

2. Surface Area of the Inner Surface:
Similarly, we can calculate the surface area of the inner surface using the formula for the curved surface area of a hemisphere:
A_inner = 2πr_inner²
= 2π(3.25)²
= 2π(10.5625)
= 21.125π cm²

3. Outer Curved Surface Area:
The outer curved surface area is the difference between the surface areas of the outer and inner surfaces:
Outer Curved Surface Area = A_outer - A_inner
= 24.5π - 21.125π
= 3.375π cm²

4. Approximating the Value of π:
To get the value of the outer curved surface area, we need to approximate the value of π. Taking π = 3.14, we can calculate the approximate value of the outer curved surface area:
Outer Curved Surface Area ≈ 3.375 x 3.14 cm²
≈ 10.6015 cm²

Rounding the value to the nearest whole number, we have:
Outer Curved Surface Area ≈ 11 cm²

Therefore, the correct answer is option 'B' which states that the outer curved surface area of the bowl is 77 cm².