Please help! Giving brainliest if you include explanation bc I need to learn this

As we know, this deals with percentages so 10% of 50 would be 5, because 5 x 10 is 50 we can divide them into 5 equal groups. and the answer is A ; it rounds down to 50 since when you do 9 percent of 578 it goes into 52.02 groups of 9. and we round down

╔═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄╗✧   ok, now this, is epic.╚═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄╝