Corporate taxes Tantor Supply, Inc., is a small corporation acting as the exclusive distributor of a major line of sporting goods. During $2021$ the firm earned $$574,900$ before taxes.

a$.$ Calculate the firm's tax liability using a flat tax rate of $21\%.$

b$.$ How much are Tantor Supply's $2021$ after$-$tax earnings?

c$.$ What was the firm's average tax rate?

d$.$ What was the firm's marginal tax rate?