40. A certain sum at simple interest becomes Rs. 1,200 in 2 years andRs. 1,300 in 3 years, find the principal and interest percent per annum.
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Answer:
1200 for 2 year. 1300 for 3 year
Difference 100 for 1year
So for 3 years =300 rs intrest
Principle=1300-300=1000
Intrest=100/1000 *100=10
Principle=Rs.1000
INtrest=10%
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