Given P$\_0=$$$50/$share; P$\_1=$$$55/$share; d$\_1=$$$1/$share; P$\_2=$$$66/$share$,$ d$\_2=$$$1\mathrm{.}10/$share; P$\_3=$$$52\mathrm{.}80/$share; d$\_3=$$$1\mathrm{.}32/$share; P$\_4=$$$50\mathrm{.}68$; d$\_4=$$$1\mathrm{.}32/$share$.$ You bought $100$ shares in t$=0,$ bought $200$ shares at t$=1$; sold $100$ shares at t$=2$; bought $100$ shares at t$=3,$ and sold all shares at t$=4$ before receiving any dividend. What is your average arithmetic return in $\%?$