The financial gain in an ecnonmic transaction

Profit, is the right answer.

Explanation:

The portion of total revenue that remains after subtracting the total cost is termed as profit. Here the total revenue indicates the amount that a company or firm receives after selling its commodity. At the same time, the total refers to all variable costs and fixed costs of the production. Opportunity costs and explicit costs are subtracted from the revenues earned to calculate the economic profit.

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.