computer network( test series)

Question

Q.1)A system has K layer hierarchy protocol application generates a message of l bytes at each of the layer and c byte of header is added the fraction of the network bandwith used on this message..................

a) l/(l-k*c)

b)l/(l+k*c)

c) l/$(l+k*c)^{s}$

d) none of these

Comments

before 1st layer , total message = l

after 1st layer, total message = l + c

after 2nd layer, total message = l + c + c = l+2c

after Kth layer, total message = l + c + c = l+Kc

efficiency = $\frac{l}{l+Kc}$

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i am getting b

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Is efficiency= useful data/ total data????

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B is correct option

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Is efficiency= useful data/ total data????

yes 

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got it.i forget the basic definition of efficiency.