can i have help solving the questions for C

(Unrelated to last problem) Sony has overall Revenue of $90 bil, variable costs of 34.3 bil and fixed costs of 33 bil. (Do not add zeroes!) Assume a price of good of $120 and variable cost of $46. Assume a tax rate of 21%. a. What is break even revenue? b. What is break even quantity? c. Calculate the EBIT of Sony i. At current level of revenues ii. If revenues go up 20% iii. At revenues go down 20% iv. What is the % change in EBIT