You've run 200 ft of cable and lost 5 dB. What is the loss
rate of your cable per 100 ft?

Loss  rate of cable per 100 ft = 2.5 ft

Explanation:

Given:

Length of total cable = 200 ft

lost in cable = 5 dB

Find:

Loss  rate of cable per 100 ft

Computation:

Loss  rate of cable per 100 ft = 100[5/200]

Loss  rate of cable per 100 ft = 2.5 ft