9) A sweater costs $60 and is sold at a 20% discount. The store charged Aria $12. Is this correct? How do you know? Be clear and
complete.

No

Step-by-step explanation:

I know because if you take 20 percent of 60 you get 12.

60 × .20 = 12

But, that doesn't mean the sweater is $12, you only calculated the discount.

next, take 60-12= $48

She should've been charged $48

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies