(B)
the product of—
(i)
the number of contribution base units for which the employer would have been required to make contributions for the prior plan year if the employer had not withdrawn, multiplied by
(ii)
the contribution rate for the plan year which would be required to meet the amortization schedules contained in section
1423
(d)(3)(B)(ii) of this title (determined without regard to any limitation on such rate otherwise provided by this subchapter)
except that an employer shall not be required to pay an amount in excess of the withdrawal liability computed with interest; and