A sum of SI becomes Rs 7890 in 3 years and Rs 10410 in 7 years . Find the sum and the rate of interest .
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Step-by-step explanation:
Amount in 3years=7890rs
Amount in 7years=10410rs
on subtracting, we get
S.I for 4 years=10410-7890
=2520rs
S.I for 3 years=2520/4×3
=1890rs
sum =7890-1890
=6000rs
now,
sum=6000
S.I=1890
time=3 years
rate =1890×100/6000×3
= 10..5 percent
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