Write your MySQL query statement below
select Request_at as Day
,round(sum(case when t.status!='completed' then 1 else 0 end) /count(1),2) as "Cancellation Rate"
from Trips as t
inner join Users as u on t.Client_id=u.Users_id
where u.Banned='No' and t.Request_at between '2013-10-01' and '2013-10-03'
group by t.Request_at