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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