Choice "A" is correct. ($310,250/365) x 90=$76,500. Zinco will be taxed as an S corporation from January 1 to March 31, Year 1, and a C corporation from April 1 to December 31, Year 1. Absent the election to calculate the incomes of the S and C corporation portions of the year separately, Zinco's income is allocated on a per-share, per-day basis between the S and C corporation portions of the taxable year. Year 1 has 365 days, 90 of which occurred before April 1.
Choice "d" is incorrect. Absent the election to calculate the incomes of the S and C corporation portions of the year separately, Zinco's income is allocated on a per-share, per-day basis between the S and C corporation portions of the taxable year. This is the income allocated to the C corporation portion of the year.
Choice "c" is incorrect. Absent the election to calculate the incomes of the S and C corporation portions of the year separately, Zinco's income is allocated on a per-share, per-day basis between the S and C corporation portions of the taxable year, not on a 50/50 split.
Choice "b" is incorrect. Zinco's income must be allocated on a per-share, per-day basis between the S and C corporation portions of the taxable year.