my answers are

FOR A

Payback Period = 4.13 Years

NPV = Rs. -5,937

Profitability Index = 0.97

FOR B

Payback Period = 3.67 Years

NPV= Rs. 16,585

Profitability index = 1.08



Formulas are

for payback period "http://www.zenwealth.com/BusinessFinanceOnline/CB/PaybackPeriod.html"

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FOR NPV

NPV = sum of all PV -Initial Investment

FOR PI

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PI = sum of all PV / Initial investment