What is the transmission efficiency of a 5000 byte file sent

What is the transmission efficiency of a 5000 byte file sent in response to a web request HTTP, TCP/IP, and Ethernet? Assume the HTTP packet has 100 bytes in addition to the 5000-byte file. Assume that the maximum packet size is 1200 bytes.

Solution

efficiency = user data / total transmission size

User data= 1200 bytes

Transmission size = 1223 bytes

Efficiency= 1200/1223 = .98

(.98) * 4= 3.92

User data=271 bytes

Transmission size = 1223 bytes

Efficiency=271/1223 = .22

Total transmission efficiency = (3.92 + .22) / 5

= .828

=.83