Please answer all and show calculations!!

$30.$ When marginal costs are above average total costs

$[a]$ then average total costs are minimized.

$[b]$ then average total costs are falling.

$[c]$ then average fixed costs are rising.

$[d]$ then average total costs $ae$ rising.

$31.$ Consider the market shown $in$ the above graph. Suppose $a\frac{?}{(\frac{?}{?}\text{\$}5\frac{?}{?})}$ tax $is$ imposed $on$ sellers. Which $of$ the following statements $is$ true?

I. Producers bear more $of$ the tax burden than consumers.

$II.$ The tax$-$inclusive price $(or$ after$-$tax price$)$ received $by$ sellers $is\frac{?}{(\frac{?}{?}\text{\$}8\frac{?}{?}).}$

III. The deadweight loss $is\frac{?}{(\frac{?}{?}\text{\$}15,000\frac{?}{?}).}$

$[a]$ I only

$[b]II$ and III only

$[c]$ I and $II$ only

$[d]$ I, $II,$ and III

For a firm $in$ a monopolistic competitive market. Which $of$ the following $is$ false?

$[a.]$ Marginal Revenue $>$ Price

$[b.]$ Marginal Revenue $$ Price

$[c.]$ The firm's long$-$run profit $is0.$

$[d.]$ The firm's short$-$run profit can $be$ negative, positive, $or0.$

Adam $is$ willing $to$ buy a bottle $of$ water $at$ the price $of$ $$\frac{2}{b}$ottle. Bryan $is$ willing $to$ buy three bottles $of$

water $at$ the price $of$ $$\frac{1\mathrm{.}5}{?}$ bottle. Cathy $is$ willing $to$ buy two bottles $of$ water $at$ the price $of$

$$\frac{1\mathrm{.}75}{b}$ottle. The market price $is$ $$\frac{1\mathrm{.}75}{b}$ottle. What $is$ the consumer surplus?

$[a]$ $$2$

$[b]$ $$0\mathrm{.}15$

$[c]$ $$0\mathrm{.}25$

$[d]$ $$1\mathrm{.}75$

Which $of$ the following statements $is$ false for a monopolist?

$[a]$ They produce a quantity less than the perfectly competitive equilibrium.

$[b]$ They maximize profit $by$ setting equal their marginal revenue and marginal cost.

$[c]$ Their long$-$run economic profit $is$ greater than zero.

$[d]$ They are price takers and $do$ not hold market power.

The figure above illustrates a market for gasoline with $a$ $$1$ tax imposed $on$ the buyers. What $is$ the

seller's tax incidence?

$[a.]$ $$0\mathrm{.}25$

$[b.]$ $$0\mathrm{.}50$

$[c.]$ $$1\mathrm{.}00$

$[d.]$ Between $$0\mathrm{.}00$ and $$1\mathrm{.}00$ depending $on$ elasticity $of$ supply.