Answer:
[tex]92.9\%[/tex]
Step-by-step explanation:
Initial amount of birdseed = 10.5 pounds
Final amount of birdseed = 12 ounces
[tex]1\ \text{ounce}=\dfrac{1}{16}\ \text{pounds}[/tex]
[tex]12\ \text{ounces}=\dfrac{12}{16}=0.75\ \text{pounds}[/tex]
Percentage change in the amount of birdseed is
[tex]\dfrac{\text{Initial-Final}}{\text{Initial}}\times 100\%=\dfrac{10.5-0.75}{10.5}\times 100\%\\ =92.9\%[/tex]
The percentage of birdseed that changed is [tex]92.9\%[/tex]