Roberto Designers was organized on January 1, 2018. The firm was authorized to issue 160,000 shares of $6 par value common stock. During 2018, Roberto had the following transactions relating to stockholders' equity: Issued 16,000 shares of common stock at $8 per share. Issued 32,000 shares of common stock at $9 per share. Reported a net income of $160,000. Paid dividends of $80,000. Purchased 3, 500 shares of treasury stock at $11 (part of the 32,000 shares issued at $9). What is total stockholders' equity at the end of 2018?

a. $416,000
b. $457, 500
c. $576,000
d. $489, 500

What is the difference between total utility and marginal utility? a. marginal utility is subject to the law of diminishing marginal utility while total utility is not. b. total utility represents the consumer optimum while marginal utility gives the total utility per dollar spent on the last unit. c. total utility is the total amount of satisfaction derived from consuming a certain amount of a good while marginal utility is the additional satisfaction gained from consuming an additional unit of the good. d. marginal utility represents the consumer optimum while total utility gives the total utility per dollar spent on the last unit.