modelling question?

A system is modelled, with 2 unknown parameters A and B, as dy(t)/dt+ A y(t)= B f(t) Given the response to a unit step f(t) reaches a value 0.7 which is 63% of its steady-state, after 3.03 seconds, compute B. Answer with 2 d.p.   

 

Need process and answer. Thank you

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