A company must choose between buying software (Tk 50 lakh), building it (Tk 40 lakh if easy, probability 0.3; Tk 50 lakh if hard, 0.7) or modifying…

A company must choose between buying software (Tk 50 lakh), building it (Tk 40 lakh if easy, probability 0.3; Tk 50 lakh if hard, 0.7) or modifying open-source software (Tk 30 lakh for small changes, 0.2; Tk 50 lakh for large changes, 0.8). Which should it choose?