Answer:
Explanation:
The scouting troop can collect a maximum of **15 pounds of aluminum** and **20 pounds of paper** for a total weight of **35 pounds** ¹.
If the troop earns $2.50 per pound for aluminum and $0.50 for paper, the maximum profit they can make is:
```
(15 pounds of aluminum x $2.50 per pound) + (20 pounds of paper x $0.50 per pound) = $37.50 + $10 = $47.50
```
Therefore, the correct answer is **$45** ¹.