During the year just ended, Shering Distributors, Inc., had pretax earnings from operations of $490,000.$ In addition, during the year it received $20,000$ in income from interest on bonds it held in Zig Manufacturing and received $20,000$ in income from dividends on its $5\%$ stock holding in Tank Industries, Inc. Shering is in the $40\%$ tax bracket and is eligible for a $70\%$ 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 $\backslash ($ c $\backslash ).$ e$.$ What is the firm's total tax liability for the year?