If the tube length and tank height are both 50'01" and you sound an ullage of 32'09", what is the level of fluid within the tank?

Correct Answer: Option B — 17'04"

Fluid level is calculated by subtracting the ullage from the total tank height. With a tank height of 50'01" and an ullage of 32'09", the calculation is 50'01" minus 32'09". Borrowing 1 foot (12 inches) from the feet column yields 49'13" minus 32'09", resulting in 17'04" of fluid.