the difference in simple interest on a certain sum of money for 3 and 5 yeare at 12% p.a.is Rs. 432. find the principal amount.
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Answer:
1750
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si for 3 yrs = p*t*r/100
= p*3*12/100
= 36p/100
si for 5 yrs = ptr/100
= p*12*5/100
= 60p/100
si1-si2= 432
60p/100-36p/100=432
0.24p=432
p=432/.24
p=1800
The principal is Rs. 1800
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