Answer:
efficiency
Explanation:
Efficiency is to increase the level of performance by using the least amount of input by reducing unnecessary resources. In the example given your dad increases efficiency by using less expensive speakers to achieve the same goal, entertain people.
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Answer:
Efficiency
Explanation:
Efficiency is finding a better way to do a particual task with a lesser energy or resources but producing an increase in perfomance, output or productivity. In this example the dad achieves greater efficiency by mounting speakers around the backyard instead of hiring a live band which is more expensice to achieve the same goal.
