If the circus were to sell all of its 220 tickets for this

Answer is 5%. The wordings were really tricky.

let p be the usual price, if 220 tickets are to be sold for this month.
Hence, revenue = 220p.

Now, let x be the number of tickets sold previous month. Since P is the usual price.
Last month's revenue = xp.

if 220 tickets were to be sold this month's revenue would have been 10% greater than previous month's. Hence,

220p = xp + (xp/10) => 220p = 1.1xp => x = 200. That mean last month's revenue was 200p ---- 1

Now, actual changes for this month :

P is increased by 5% so, this month's price = 1.05p.
Hence this month's revenue would be 210p. ------ 2

Finally(using 1 and 2):

210p-200p/200p * 100 = 5%.

. Well!! I got a Q30 in my first attempt, recently. Yeah!! that's embarrassing.
However, I am trying my best to boost my Q.

If the circus were to sell all of its 220 tickets for this month's performance at its usual price, the revenue from sales would be 10% greater than that collected last month.
For the usual ticket price to yield 10% more in revenue, the number of tickets sold this month must be 10% greater than the number sold last month.
Since 220 is 10% greater than 200, the number of tickets sold last month = 200.

If the circus raised the ticket price by 5% and sold only 200 tickets as a result, what percent less would last month's revenue be compared to this month's revenue?
Since the number of tickets sold is the same as that sold last month -- 200 -- raising the ticket price by 5% will increase the total revenue by 5%.
Let last month's revenue = $100, implying that the revenue yielded by this month's 5% higher ticket price = $105.
Percent decrease from 105 to 100 \(= \frac{Difference}{Original }* 100 = \frac{5}{105} * 100 = \frac{100}{21}\)


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let price per ticket be 100$ and 5% increase ; 105$
220*100 ; 220,00 last year revenue must be 220,00/1.1 ; 200,00 $
with price increase $105 tickets sold 200 ; 21,000
21000-20000/21000 ; 1000/21000 ;1/21*100
option C ; 100/21

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