If the ground floor elevation is +100.25 and the rooftop elevation is +130.50, what is the difference in elevation?

To determine the difference in elevation between the ground floor and the rooftop, you need to subtract the ground floor elevation from the rooftop elevation.

First, take the rooftop elevation of +130.50 and subtract the ground floor elevation of +100.25:

130.50 - 100.25 = 30.25

The result 30.25 feet needs to be converted into feet and inches for a more precise answer. There are 12 inches in a foot, so:

0.25 feet is equivalent to 0.25 x 12 = 3 inches.

This means the difference in elevation is 30 feet and 3 inches, which corresponds to the second option. Understanding how to convert between feet and inches is crucial for accurately interpreting measurements in construction and related fields.