The simple interest on a certain sum for 3½ years at 16% per annum is 390 more than the simple interest on the same sum for 2½ years at 12% per annum. Find the sum.
I wnt step by step explaination answer is Rs 1500
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Answer:
Step-by-step explanation:
let the principal be x
n=2 1/2 years
r= 12% p.a
SI= x*2 1/2*12/100
SI= 3x/10
II deposit
Principal =x
r= 16
n= 3 1/2 years = 7/2 years
Si= (x*16*7)/(2*100)
SI=112x/200
II deposit interest -I deposit interest =390
112x/200 -3x/10 =390
LCD = 200
multiply by 200 to eliminate the denominator
112x-60x=390*200
52x=390*200
x=390*200/52
x= Rs 1500 the principal
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