cost of improvement in capital gains

Respected Sir, Recently we have sold a land by dividing into small plots which is part of capital asset in partnership firm.We filed the Income Tax Returns by showing this transaction as the long term capital gain and in this long term capital gain we  show the cost of improvement as the amount to equal to  30 cents of land value as the  road formation expenditure for road  formation. Is this type of cost of improvement is allowable under cost of improvement or not. Please clarify

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