Hi......... Solve 4(a), (b) and (c) only
Answers
Question ( a )
Compare that with simple interest ..
R = 5 %
P = ?
Prize = 180 per year
I = 180 in 1 year .
I = P R T / 100
= > 180 = P × 5 ×1 / 100
= > 18,000 = 5 P
= > P = 18,000 / 5
= > P = 3,600
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ANSWER :
The sum will be Rs. 3,600
Question ( b )
I = P R T / 100
I = 1 / 4 P for 5 years
P R T / 100 = 1 / 4 P [ when T = 5 ]
= > R T / 100 = 1 / 4
= > R × 5 = 100 / 4
= > R × 5 = 25
= > R = 25 / 5
= > R = 5 %
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ANSWER :
The rate of interest would be 5 %
Question ( c )
A = 2 P
= > P + I = 2 ( P )
But I = P R T / 100
= > ( P + P R T / 100 ) = 2 P
= > P ( 1 + R T / 100 ) = 2 P
= > ( 1 + R T / 100 ) = 2
= > R T / 100 = 2 - 1
= > R T / 100 = 1
= > R T = 100
= > T ( 6 + 1/4 ) = 100
= > T × 25/4 = 100
= > T = 100 × 4 / 25
= > T = 4 × 4
= > T = 16
ANSWER :
The time required would be 16 years.
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Hope it helps !!
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