Lab

import matplotlib.pyplot as plt


c1 = 90
c2 = 12

arr = [0.02, 0.09, 0.15, 0.25, 0.30, 0.32, 0.36, 0.45, 0.50, 0.54, 0.58, 0.60]
sum_pt = [0]

for i in range(len(arr)):
    sum_pt.append(sum_pt[-1] + arr[i])
print(sum_pt)

carr = []

# "{:.2f}".format(a_float)
for i in range(len(arr)):
    value = (sum_pt[i] * c1 + c2) * 100. / (i + 1.)
    carr.append(value)
for i in range(len(arr)):
    sum_i_pt = "{:5.2f}".format(sum_pt[i])
    arr_i = "{:5.2f}".format(arr[i])
    carr_i_fmt = "{:5.2f}".format(carr[i])
    index = "{:2d}".format(i + 1)

    print(f"T = {index}, P(t) = {arr_i}, Sum(P(t)) = {sum_i_pt}, C(T) = {carr_i_fmt}")

index_arr = []
for i in range(len(arr)):
    index_arr.append(i + 1)

plt.plot(index_arr, carr)

plt.xlabel("Months")
plt.ylabel("Costs")

plt.show()