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Answer

Correct Option is Only (i), (ii) and (iii)

Solution:When swing operates on mode II, it will consume (q+10) units/hour.
And, (q+x)=19
Now, total units consumed = 8(q+10) units
And, total bill when q is greater than 9 = Rs.(8(q+10)×x)+200
Now, when q = 10 and x = 9, then total bill = 8(10+10)×9+200 = Rs.1640
And, when q = 13 and x = 6, then total bill = 8(13+10)×6+200 = Rs.1304
So, possible value of bill is between Rs.1640 & Rs.1304.
Hence, (i), (ii) & (iii) are only possible values.

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