0. 0-10    months: 10USD
1. 10-20   months: 50USD
2. 20-30   months: 100USD
3. 30-40kk months: 130USD
4. 40-50kk months: 200USD
5. 50-60kk months: 260USD

import numpy as np
import matplotlib.pyplot as plt

def situationNmonth(n):
    #Returns situation after Nth month.
    return np.sum([1000*np.exp(0.05*n/12) for n in range(n)])

def myHistory(test):
    return [situationNmonth(n) for n in range(60)]

def interests(n):
    #Returns interest given a month n.
    return situationNmonth(n)-n*1000

def plotInterests(test):
    plt.plot([x for x in range(60)], [interests(n) for n in range(60)])
    plt.title("5% interests over 60 months with 1k USD per month.")
    plt.show()