Give a rough estimate and also a closer estimate of `4, 89 , 342-48 , 365.`

Give the estimated available water resource in India.

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens) : (a) 439 + 334 + 4,317 (b) 1,08,734 – 47,599 (c) 8325 – 491 (d) 4,89,348 – 48,365 Make four more such examples.

A machine is purchased for Rs 1,60,000 and it is estimated that after its estimated useful life of 4 years its scrap value would be Rs 10,000. It is decided to depreciate the machine by the Diminishing Balance Method. Find out the per cent rate of Depreciation per annum.