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J m -4- either of the two refund methods hereinafter set forth; provided that the election once made, shall be binding upon the Company and the applicant and may not thereafter be changed: (a) Revenue Method. For a period not ex- ceeding ten (10) years from the date of completion of the main extension, the^Com­pany will refund to the party making the advance, or other party entitled thereto, annually, 35# of the gross revenues col­lected from consumers occupying the property to which the said extension has been made; provided, that the total payments thus made by the Company shall not exceed the amount advanced without interest. (b) Proportionate Cost Method. For a period not exceeding ten (10)years from the date of completion of the main exten­sion, the Company will make refund to the party making the advance, or other party entitled thereto, for each bona fide con­sumer within the subdivision or tract in an amount equal to the average total installed cost of 50 feet of the facilities necessary to furnish water to and within such subdivision or tract; provided, how­ever, that the total payments thus made by the Company shall not exceed the amount advanced without interest. Each such refund shall be made only at the time of the orig­inal installation of service pipes and institution of service to a bond fide con­sumer, and no additional refund right shall accrue as a result of any subsequent change in such service, change in oeeupancy, identity of the consumer, or any reason whatsoever. A consumer entitling the ap­plicant to refund, as referred to above, shall be a consumer, exclusive of a sub- divider, developer or builder, who occupies premises which are improved and contain permanent structures with suitable facilities for the use of water and who has received water service from the main for which ex­tension deposit was made for three con­secutive months. All main extensions constructed pursuant to the above provision of the Rule 9 shall be of size, type and