The total return from the stock investment is:
Total return in $ = $28.20 * 400 + $1.34 * 400 - $26.15 * 400
Total return in $ = $1,356.00
Or in percentage, this is equivalent to:
%return = 1356/(26.15*400) *100%
%return = 12.96% (A gain of ~13% from your stock investment)