670.74. For the purposes of section 670.73, the rebate to which a builder is entitled, in respect of the residential complex, is equal to the amount determined by the formula
A × 7.5 % × (1 − B/C).
For the purposes of the formula,(1) A is the amount of the rebate to which the builder is entitled under paragraph f of subsection 1 of section 256.75 of the Excise Tax Act (Revised Statutes of Canada, 1985, chapter E-15) in respect of the residential complex;
(2) B is the amount by which the amount of the rebate to which the builder is entitled under section 378.8 or 378.14 in respect of the residential complex, exceeds the result obtained by multiplying 7.5% by the amount of the rebate to which the builder is entitled under subsection 4 of section 256.2 of the Excise Tax Act in respect of the residential complex; and
(3) C is the amount by which the amount of the tax payable under section 16 in respect of the supply deemed to have been made under section 223, exceeds the result obtained by multiplying 7.5% by the amount of the rebate to which the builder is entitled under subsection 4 of section 256.2 of the Excise Tax Act in respect of the residential complex.