An amount in 4 years is 7000 and in 8 years 10000. Find rate
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let the prinicipal be P and rate be r% p.a.
when time = 4yrs
S.I. = (P * 4 * r)/100
= Pr/25
so amount = P + Pr/25
= 7000 = P + Pr/25
= P = Pr/25 - 7000
when time = 8 yrs
si = (p * r * 8)/100 = 2pr/25
so amount = 2pr/25 + p
10000 = 2pr/25 + p
p = 2pr/25 - 10000
so 2pr/25 -10000 = pr/25 - 7000
= pr/25 = 3000
= pr = 75000
Answered by
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Step-by-step explanation:
let the prinicipal be P and rate be r% p.a.
when time = 4yrs
S.I. = (P * 4 * r)/100
= Pr/25
so amount = P + Pr/25
= 7000 = P + Pr/25
= P = Pr/25 - 7000
when time = 8 yrs
si = (p * r * 8)/100 = 2pr/25
so amount = 2pr/25 + p
10000 = 2pr/25 + p
p = 2pr/25 - 10000
so 2pr/25 -10000 = pr/25 - 7000
= pr/25 = 3000
= pr = 75000
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