Calculate total road area deducted for 10 ft, 13 ft, 16 ft, or 20 ft roads, net saleable land in Ropani or Bigha, and effective usable price per Aana.
Road deduction is calculated by multiplying the road width (e.g. 13 ft, 16 ft, or 20 ft) by the length of the road passing through the property. The resulting square footage is subtracted from the gross land area to determine the remaining net usable area.