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Solution
There are two ways of solving the question.
a) Considering deprecition
b) Without depreciation
a) Considering depreciation NPV will be
= 310000 (Cash flow) - 31000 (Depreciation, 310000/10) * 3.3946 (Interest rate 1.13 for 10 years i.e 1.13*1.13*1.13*1.13*1.13*1.13*1.13*1.13*1.13*1.13)
= 947084
= 947084 - 1650000 (cost of machine)
= -702915
So NPV is negative 702915.
b) Without depreciation NPV will be
= 310000 (Cash flow) * 3.3946 (Interest rate 1.13 for 10 years i.e 1.13*1.13*1.13*1.13*1.13*1.13*1.13*1.13*1.13*1.13)
= 1052316
= 1052316 less 1650000 (cost of machine)
= -597684
So, without depreciation NPV is negative 597684.
NPV if machine is purchased at given years:-
We are solving the question without considering the depreciation:-
If purchased at year 1:-
= 310000 * 3.3946 - 1548000 (1650000 - 102000)
= -495674
If purchased at year 2:-
= 310000*3.3946 - 1446000 (1548000 - 102000)
= -393674
If purchased at year 3:-
= 310000*3.3946 - 1344000 (1446000-102000)
= -291674
If purchased at year 4:-
= 310000*3.3946 - 1242000 (1344000-102000)
= -189674
If purchased at year 5:-
= 310000*3.3946 - 1140000 (1242000-102000)
= -87674
If purchased at year 6:-
= 310000*3.3946 - 1140000 (Because it will not reduce once it reaches 1140000 as given in the question)
= -87674
So, the machine should not be purchased.
(Note :- If we had solved the above question considering depreciation, 31000 depreciation should be reduced from the cashflow 310000)
In the question, it is not given whether we should consider depreciation or not.

