Question

twenty percent of what is 9? Jonas answered this question as shown. Explain his error and provide the correct solution.

I am posting the pic to this question in comments...

Answer 1

x times 0.2 = 9

Answer 2

Third line down it states:
9 = .02 • x
That should be
9 = .2 • x

Answer 3

I got it, but thanks! Can you check though?

When he changes 20% into a fraction changes it to 0.02 which is wrong. If 0.02 is a percent it would be 2%. 20% in decimal form is 0.2 so let's replace 0.02 with 0.2.

a = p% • b
9 = 20% • x
9 = 0.2 • x
9/0.2 = 0.2 • x/0.2
9/0.2 = x
45 = x

Answer 4

per cent means "for every hundred" so 20% =
20/100 = .2

Answer 5

I know. I got it like right when I posted this, but can you check and see if I got it right?

Answer 6

I was right.. Thanks