Question: when we put a rough estimates usually we find that the actual cost much higher, why we under estimates the cost. by doing simple calculation
when we put a rough estimates usually we find that the actual cost much higher, why we under estimates the cost. by doing simple calculation show that there is more chance to go up in cost (show why the possibility of actual cost more than rough estimates) (text not allowed) rough estimates accuracy = -30%to +60%
it need only calculation
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