Trading income as business income | Depreciation

Taxation
1

In case of trading shown as business income, for how many years can I claim depreciation for the same laptop?
Y1 - 40% depreciation
Y2 - Again 40% depreciation? Is it on the original invoice value? or the already depreciated value after Y1?

2

Written down Value.

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3

what does writen down value mean?

last year I claimed 40% on a 60k laptop… remaining 36k value
this year - what can I claim? 40% of 60k or 40% of 36?

4

This.

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5

Thank you…!
And for how many years can I claim this?

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6

For as long as you hold your laptop.

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7

How can we calculate depreciation on smartphone. it is used for trading as well as personal use.