The best way to answer the question is to look at the data. For example, on H&M in April 2000:
Close Price Div
14/04 225 1.35
ThomsonReuters, Bloomberg and Factset do the following calculation for the return (+/- rounding):
r = 236/240 * (225 + 1.35)/236 * 238/225 - 1
Firstly, return is based upon the amount gained over a period of time. So your calculation for a percentage return should actually be be:
(Sale price - Cost basis)/Cost Basis.
A "total return" price series or index is a transformation of the original traded price timeseries to a timeseries that can be used to estimate/calculate a ...