7. Product sum 2

select name, round(sum(amount_paid)/
(select sum(amount_paid) from order_items)* 100.0,2) as pct
from order_items
group by 1
order by 2 desc;

I just don’t understand what is the meaning of * 100.0,2) as pct. Also, why is there a ) at the end of number 2

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