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Arithmetic Progressions

Answer:

In the given problem, the total amount = Rs 10710.

For the first half and hour (30 minutes) he counts at a rate of Rs 180 per minute. So,

The amount counted in 30 minutes

So, amount left after half an hour

After 30 minutes he counts at a rate of Rs 3 less every minute. So,

At 31st minute the rate of counting per minute = 177.

At 32nd minute the rate of counting per minute …

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