Final answer:
To save money and make old concrete and asphalt useful again, you can recycle them by crushing them into smaller pieces and using them as aggregate for new construction projects. Another option is to repurpose them for road construction or building artificial reefs.
Step-by-step explanation:
One way to save money and make old concrete and asphalt useful again is by recycling them. Concrete and asphalt can be crushed into smaller pieces and used as aggregate for new construction projects. This saves money on the cost of purchasing new materials and reduces the amount of waste sent to landfills. Another option is to repurpose old concrete and asphalt by using them for road construction or building artificial reefs. By reusing these materials, the need for new raw materials is reduced and natural resources are conserved.