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the simple interest on a certain sum for 7/2 years at 7% is 225 more than the simple interest on the same sum for4 years at 5%p.a find the sum |
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Answer» let PRINCIPAL be x n=4 years r= 5% p.a SI= x*4*5/100SI= x/5 II deposit Principal =xr=7n= 3 1/2 years = 7/2 yearsSi= (x*7*7)/(2*100)SI=49x/200 II deposit INTEREST -I deposit interest =225 49x/200 -x/5 =225LCD = 200multiply by 200 to eliminate the denominator49x-40x=225*2009x=225*200x=225*200/9x= RS 5,000 the principal |
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