O. 5 The manager at a construction site is considering drilling of a borewell for water supply It is known that in the past, only 6076 of the borewells in that area drilled succesyful at 251 depth, Also, it is known that on finding no water at 25 m, some people drilled it further to 30 m hot only 255 of them struck water at that level, The manager knows that if water is not found in his own well, he has to pay Re 40000 to buy water from water suppliers for the same period of getting water from the well, The cost of drilling is Ra 800) per metre, Draw decision tree and help the manager to reach an optimal decision