Ronald operates a magazine stand at the corner of CM Recto and Lepanto. Every week he purchases Kislap magazine at P$4\mathrm{.}50$ a copy and sells each for P$8\mathrm{.}00$

Copies of Kislap magazine left at the end of the week must be discarded or sold at a salvage value. Find the EV of the optimal weekly stock if probabilities are:

$EV=$

What is the optimal stock action by minimizing the expected regret value.