Looking at pensions funds, growth rate on the basic funds is easy to work out from the change in unit price over time.
However, one of the funds is a with profits one, and most of the growth is (hopefully) in the bonus element, with the basic unit price increasing at about 4%.
So with regular *on-going contributions*, how do I calculate the equivalent growth rate for a specific period from X = start value of fund + start value of bonus Y = end value of fund + end value of bonus Over a period where there has been n equal contributions of C?