505.3R1. For the purposes of section 505.3 of the Act, the prescribed manner is to determine the amount provided for in section 497 of the Act by the formula
A × B/C.
For the purposes of that formula,(1) A is the amount of the recovered bad debt;
(2) B is the amount provided for in section 497 of the Act, included in the aggregate of the sales that are the amount of the debt to which the amount of the recovered bad debt relates;
(3) C is the aggregate of the sales that are the amount of the debt to which the amount of the recovered debt relates, including the amount provided for in section 497 of the Act, the tax payable under Part IX of the Excise Tax Act (R.S.C. 1985, c. E-15) and the tax payable under Title I of the Act.