Office area in “square units”: An office floor measures 13 units by 9 units (rectangular). Compute the total area in square units.

Introduction / Context:
A straightforward rectangle area calculation using unit measures (no physical units given).

Given Data / Assumptions:

• Length = 13 (units)
• Breadth = 9 (units)
• Area unit is “square units”.

Concept / Approach:
Area of a rectangle A = L * B.

Step-by-Step Solution:

Verification / Alternative check:
Break 13 as 10 + 3: 10*9 = 90; 3*9 = 27; sum 117.

Why Other Options Are Wrong:
97, 107, 127, 81 are not equal to 13*9.

Common Pitfalls:
Adding instead of multiplying, or mixing up perimeter with area.

Final Answer:
117