Let say the total revenue(Box office receipts) earned by the independent movies last year be 'X'. So according to the facts present in the argument, the total revenue earned by independent movies for the first half of this year should be:
20% more X => (120/100)*X
So now we have both amounts with us. Let us now take the averages.
For last year, the average revenue earned per movie will be:
For this year(half-of-the-year), the average revenue earned per movie so far will be:
=> 3 times the average revenue earned per movie last year.
So this proves option 'D' mathematically too. And it proves beyond the confusion of either 'receipt-revenue' word game or price-per-ticket stimuli.
As international, I did not refer receipts to revenues, that is why I chose wrongly also. Thanks!