Red Inc. is a C corporation and a calendar year taxpayer. Red reports sales of $24 million in 2017, $28.3 million in Year 2018, and $32 million in 2019. 

a) Is Red subject to the business interest limitation in 2020?

b) Suppose that besides sales, Red also reports sales returns of $3.1 million in each year 2017-2019? Is Red subject to the business interest limitation in 2020?

c) Suppose that Red began business on January 1. 2018 and reported gross receipts of $25.3 million in Year 2018 and $28.9 million in 2019. Is Red subject to the business interest limitation in 2020?

d) Suppose that Red began business operations on October 1, 2019 and reported $6.2 million in gross receipts for the three-month 2019 short year. Is Red subject to the business interest limitation?