Contribution Calculations Help....

[PQuayle]

Salary (S)
Annual salary Increase (I)
Employer Contribute fixed % of salary (P)
Annual Return % (A)
Years (Y)

Target Value (X)

My Annual Contribution % of Salary to achieve target (?)
My Annual Contribution level £ to achieve target (?)


Can any one solve the two contribution levels the hard bit is Annual salary increases.

Thanks