# Interest rate calculation [closed]

The task: With what interest rate given 2000 Euros after 2 years and 3000 Euros after 4 years, the actual value will be equal 4000 Euros. This task sounds confusing for me, I tried to calculate, but get nothing valid, so maybe I don't understand the task formulation. Here is given answer: 7.3%. Should I use discount interest or which method? I'm really new in this field.

• You have to find the discount rate $r$, so that 2000 Euros received in 2 years and 3000 Euros received in 4 years equal 4000 Euro today, i.e. solve the equation $4000 = \frac{2000}{(1+r)^2} + \frac{3000}{(1+r)^4}$, which results in $r$ = 7.3%. – skoestlmeier Jan 8 at 14:15

try this : 4000= 2000/(1+r)^2 + 3000/(1+r)^4 solving this equation for r you'll find equals 7.30274083178438%.

from scipy.optimize import root