Question 45017
{{{E = P ( 1 - e(y-1))}}}
Divide by P:
{{{E/P =  1 - e(y-1)}}}
Rearrange by addition and subtraction:
{{{e(y-1) =  1 - E/P}}}
Divide by e:
{{{y-1 =  1/e - E/Pe}}}
Add 1 to give y:
{{{y =  1/e - E/Pe+1}}}
I hope this helps.
P.S. I am trying to start up my own homework help website. I would be extremely grateful if you would e-mail me some feedback on the help you received to adam.chapman@student.manchester.ac.uk
Adam