Answers

2015-01-11T17:45:57+05:30
Part 1:
Principal=₹2000, Time=2 yrs, Interest=2%
Amount=P*R*T=2000*2*2%=₹80
Total=₹2000+₹80=₹2080
Part 2:
Principal=₹1000, Time=2 yrs, Interest=5%
Amount=P*R*T=1000*2*5%=₹100
Total=₹1000+₹100=₹1010
Part 3:
Total to be returned=₹2080+₹1010=₹3090
Money returned=₹2800
Cost of watch =₹3090-₹2800=₹290

Therefore Cost Of Watch is ₹290.
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2015-01-11T19:00:50+05:30
We have P= Rs 2000 at t=2% and n= 2
Then the interest = P*T*3
                         =  2000*2*2/100 = 80
Similarly interest on Rs1000 = 1000*5*2/100= 100
He has to pay back =2000 + 1000 + 80 + 100= 3180
ATQ  Cost of watch +2800= 3180
         Cost of watch = 3180 - 2800 = 380
Cost of the watch is Rs 380
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