Question

RS 1200 is invested at 4 percent simple interest per annum in how much time will it double itself

Answer 1

P = ₹1200
R = 4%

For doubling itself, simple interest should be equal to principal or
SI = ₹1200

SI = PTR/100

1200 = 1200×T×4/100

T = 1200×100/(1200×4)

T = 25 YEARS

IT WILL DOUBLE ITSELF IN 25 YEARS.

Answer 2

hi,

formula to be used
I = PRT/100
here P =1200 ( given )
and R = 4%
and I = double the P as it is given
therefore I = 2 ×P = 2 × 1200 = 2400

now to find T

therefore
I = PRT/100
100I /PR = T { bringing 100 and PR to LHS}
T = 100(2400)/1200 × 4
T = 50

therefore it will take 50 years

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