DIS.
1. What sum of money will amount to rs840 in 3 years at 4% interest per year ?
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Step-by-step explanation:
Amount = rs840
let principal be p
thus , interest = amount - principal = rs 840 -p
time =3 yrs
rate of interest. = 4% p.a.
We know that,
interest = P*T*R/100
=> 840 - p = p * 3 * 4/100
=> 840 - p = 3p / 25
=> 21,000 - 25p = 3p (cross multiplication)
=> -25p - 3p = -21,000
=> -28p = -21,000
=> p = -21,000/-28
=> p = 750
Ans. the sum of money is rs 750
(note that sum of money is principal )
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