In which of the following situations, does the list of numbers involved make an arithmetic progression, and why?
(i) The taxi fare after each \( \mathrm{km} \) when the fare is ₹ 15 for the first \( \mathrm{km} \) and ₹ 8 for each
D additional km.
(ii) The amount of air present in a cylinder when a vacuum pump removes \( \frac{1}{4} \) of the air remaining in the cylinder at a time.
(iii) The cost of digging a well after every metre of digging, when it costs ₹ 150 for the first metre and rises by \( ₹ 50 \) for each subsequent metre.
(iv) The amount of money in the account every year, when \( ₹ 10000 \) is deposited at compound interest at \( 8 \% \) per annum.
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