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Gain Bandwidth Product for OpAmp

Ask
EC.27)The gain bandwidth product for a 741-opamp , given the closed loop gain, A_v=80dB and the cutoff frequency at that gain f_c=80Hz is 
(a)800k 
(b)80k 
(c)8k
(d)none of the above

Answer is (a)
Concept
Given , 20 log_{10} A_v = 80 dB; \implies A_v = 10^4.
Bandwidth product is given by A_v\times f_c = 10^4 \times 80 = 800k


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