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Option 3 : Rs. 4000

Given:

Half the amount became 33/25 of itself in 8 years

SI in 3 years on remaining amount = Rs. 240

Formula used:

S.I = PRT/100

S.I = Final amount – Principal amount

Calculation:

Let the amount he had in the starting be 2x and Rate of interest = R%

In first account,

Amount deposited = 2x/2 = x

Time = 8 years

Final amount = 33x/25

⇒ S.I = 33x/25 – x

⇒ S.I = 8x/25

Now, 8x/25 = x × R × 8/100

⇒ x/25 = xR/100

⇒ R = 4%

In second account,

Amount deposited = 2x – x = x

Time = 3 years

S.I = Rs. 240

Rate = 4%

Now,

240 = x × 4 × 3/100

⇒ 20 = x/100

⇒ x = 2000

∴ Total amount he had in the starting = 2x

⇒ 2 × 2000

⇒ Rs. 4000

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