Interest versus dividend income last year, shering corporation had pretax earnings from operations of $ 496.000. in addition, it received $ 30.000 in income from interest on bonds it held in zig manufacturing and received $ 30.000 in income from dividends on its 6 % common stock holding in tank industries, inc. shering is in the 21 % tax bracket and is eligible for a 50 % dividend exclusion on its tank industries stock. a. calculate the firm's tax on its operating earnings only. b. find the tax and the after-tax amount attributable to the interest income from zig manufacturing bonds. c. find the tax and the after-tax amount attributable to the dividend income from the tank industries, inc., common stock. d. compare, contrast, and discuss the after-tax amounts resulting from the interest income and dividend income calculated in parts b. and c. e. what is the firm's total tax liability for the year?