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The simple interest on a sum of money for 10 years is Rs 3130. If the principal becomes 5 times after 5 years, then what will be the total interest (in Rs)obtained after 10 years?
- A6260
- B7825
- C9390
- D15650
Answer not set
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0
CCommunity
i think option 3 is correct
0
CCommunity
first method:
interest after 10 years = 3130
so after 5 years = 1565
so, now principal = 1565*5 = 7825
thus total interest for 10 years = 7825+1565 = 9390
second method:
si= prt/100
p*r*10 / 100 = 3130 so p*r = 31300
now,
si = si for 1st five years + si for 2nd five years
si = p*r*5/100 + 5p*r*5/100
put value of pr in the above equation
si = 31300* 5/100 + 5*31300*5/100
si= 9390
interest after 10 years = 3130
so after 5 years = 1565
so, now principal = 1565*5 = 7825
thus total interest for 10 years = 7825+1565 = 9390
second method:
si= prt/100
p*r*10 / 100 = 3130 so p*r = 31300
now,
si = si for 1st five years + si for 2nd five years
si = p*r*5/100 + 5p*r*5/100
put value of pr in the above equation
si = 31300* 5/100 + 5*31300*5/100
si= 9390