Question

An old light bulb uses 60 watts of power, but a new LED bulb uses only 9 watts. What is the percent change?

Answer 1

Answer: 85%

Explanation:

Percent of change formula is (old - new / old) * 100

So then you input the numbers

60 - 9

——— *100

60

51

— *100

60

= 0.85(100)

85%

Hope this helps!