Rearranging formulaeWatch this thread
0.103 = (P1 + 13 - 327)/327.
Posted Out Of My Brain
you can first work out what 13-327 = -314
you basically do the opposite of what it says on the right hand side - to make 327 go to the other side you have to multiply 0.103 by 327, now you have 33.681 = P1 - 314
now how will we get P1 from the equation above?