Answer:
∑
∈A
![a_(i)](https://img.qammunity.org/2021/formulas/mathematics/college/74yuvmgb70ja1yeq57xqvot0e581vyk1p5.png)
Step-by-step explanation:
The goal of every business is to maximize profit. The revenue is maximized when cost of business is minimized. The different activities will incur different cost and has different start and end time of the process, the best option to maximize the revenue is the sum of activity revenue.