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Sagot :
Answer:
12.93%
Explanation:
Given that the amount of 300 is invested for 3 years, while the amount of 100 is invested for 2 years and 100 is invested for 1 year.
also amount accumulated in three years = 800
Applying the formula to find the future value we get
300(1+r)^3 + 200(1+r)^2 + 100(1+r) = 800
which can be further simplified to
300r^3+1100r^2+1400r+600=800
where, r is the effective rate of interest which we have to find out
The above equation is cubic in r, so to solve this we can use equation solver. When we put this equation in equation solver we get
r = 0.12926
r ≅ 0.1293
Therefore, effective rate of interest = 12.93%
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