(15) The evaluation of these factors of course depends on the facts of each case. There cannot be any hard and fast or rigid rule. Common sense is the best and most reliable guide. For instance, take the factor regarding the size. A building plot of land say 500 to 1000 sq. yds cannot be compared with a large tract or block of land of say l0000 sq. yds or more. Firstly while a smaller plot is within the reach of many, a large block of land will have to be developed by preparing a lay out, carving out roads, leaving open space, plotting out smaller plots, waiting for purchasers (meanwhile the invested money will be blocked up) and the hazards of an entrepreneur. The factor can be discounted by making a deduction by way of an allowance at an appropriate rate ranging approximately between 20 percent to 50 percent to account for land required to be set apart for carving out lands and plotting out small plots. The discounting will to some extent also depend on whether it is a rural area or urban area, whether building activity is picking up, and whether waiting period during which the capital of the entrepreneur would be looked up, will be longer or shorter and the attendant hazards.