I really need help with this accounting problem! Please answer the yellow boxes! Thank you!

White truffles are a very prized and rare edible fungus that grow naturally in the countryside near alba, italy. suppose that it costs $200 per day to search for white truffles. on an average day, the total number of white truffles (t) found in alba is t = 20x − x 2 , where x is the number of people searching for white truffles on that day. white truffles can be sold for $100 each. if there is no regulation, how many more people will be searching for white truffles than the socially optimal number?

Mart's boutique has sales of $820,000 and costs of $540,000. interest expense is $36,000 and depreciation is $59,000. the tax rate is 21 percent. what is the net income? $146,150 221,200 105,000 139,050

Comparative financial statements for weller corporation, a merchandising company, for the year ending december 31 appear below. the company did not issue any new common stock during the year. a total of 800,000 shares of common stock were outstanding. the interest rate on the bonds, which were sold at their face value, was 12%. the income tax rate was 40% and the dividend per share of common stock was $0.40 this year. the market value of the company's common stock at the end of the year was $18. all of the company's sales are on account. time interest earned ratio