Final answer:
The selling price for the man to neither profit nor incur a loss on the rice would be the same as his purchase price, which is 100 units of currency. Therefore, the answer is a. 100.
Step-by-step explanation:
The question appears to have some missing information. However, I will answer based on the provided context about pricing and market equilibrium. In economics, when a product is sold at a price where there is no profit and no loss, it is said to be sold at the cost price.
This is the price at which the quantity supplied is equal to the quantity demanded, which is also referred to as the equilibrium price. If a man purchases rice at 100 units of currency, to sell the rice for no profit and no loss, the selling price must also be 100. This is because if he sold it for more, he'd make a profit; if he sold it for less, he'd incur a loss. Hence, the correct answer is a. 100.