Fourth plan year.
(iv) Fourth plan year. For the fourth plan year, 1978, Y contributes 60 percent and X and Z each contribute 20 percent of the total contributions made under the plan. The 75 percent contribution requirement of paragraph (c) of this section does not apply. The plan is not a multiemployer plan for 1978 because it fails to satisfy the 50 percent contribution requirement of paragraph (a)(3) of this section.