A rational individual bought a good at S 20 per unit and achieved equilibrium when the 10th unit was consumed, this implies that the marginal utility of this unit is

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Question 6: Step 1: In consumer equilibrium, the marginal utility (MU) of the last unit consumed is equal to its price (P). Step 2: Given that the price per unit is $20, the marginal utility of the 10th unit at equilibrium must also be$20. The correct option is A. $\boxed{A. 20 utils.}$

Question 7: Step 1: A public limited liability company (PLC) is characterized by its ability to offer shares to the general public. Step 2: To ensure transparency and protect public investors, PLCs are legally required to publish their financial accounts. The correct option is B. $\boxed{B. it is required by law to publish its accounts.}$

Question 8: Step 1: Rapid economic development often involves a shift from primary sectors (like agriculture) to secondary and tertiary sectors. Step 2: The manufacturing sector is known for its capacity to create a large number of jobs, drive industrialization, and add significant value to raw materials, thus playing a crucial role in enhancing a country's rapid economic development. The correct option is D. $\boxed{D. manufacturing sector.}$

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