1 Answers
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
5 views
Answered