at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

at the end of the year

Sum

August

September

December

We want to open an account and deposit 100 EUR into the bank account monthly (from the beginning of the year, always at the beginning of the month). 
The bank pays interest this product once a year (at the end of year).
Annual interest rate is 2,3 % and we assume that it will be stable during whole period. How much money will we have in the account  on the 31.12.?

January

February

March

April

May

June

July

October

November

A = (131.63183499312612, 327.59514157127614)
B = (1007.7256804387415, 326.3867362672132)
a = Segment(A, B)
C = Midpoint(a)
D = Midpoint(A, C)
E = Midpoint(C, B)
F = (447.02561935354765, 459.3113197141342)
b = Segment(A, F)
c = Circle(A, 100)
G = Intersect(c, b, 1)
d = Circle(G, 100)
H = Intersect(d, b, 2)
e = Circle(H, 100)
I = Intersect(e, b, 2)
f = Segment(I, D)
g = Line(H, f)
h = Line(G, g)
J = Intersect(a, h)
K = Intersect(a, g)
k = Circle(D, K)
L = Intersect(k, a, 2)
p = Circle(L, D)
M = Intersect(p, a, 2)
q = Circle(C, M)
N = Intersect(q, a, 2)
r = Circle(N, C)
O = Intersect(r, a, 2)
s = Circle(E, O)
P = Intersect(s, a, 2)
t = Circle(P, E)
Q = Intersect(t, a, 2)
Deposit = 0 (slider from 0 to 1200, step 1)
text1: "Deposit = " + Deposit
text2: "Deposit = " + Deposit
text3: "Deposit = " + Deposit
Interest = 0 (slider from 0 to 25, step 0.1)
i: y = Deposit + Deposit Interest / 100 * 0.81 * 12 / 12
R = (130.9079863362473, 301.6472224406474)
j = Segment(A, R)
l = OrthogonalLine(B, a)
m = OrthogonalLine(A, a)
n = OrthogonalLine(J, a)
a_1 = OrthogonalLine(K, a)
b_1 = OrthogonalLine(D, a)
c_1 = OrthogonalLine(L, a)
d_1 = OrthogonalLine(M, a)
e_1 = OrthogonalLine(C, a)
f_1 = OrthogonalLine(N, a)
g_1 = OrthogonalLine(O, a)
h_1 = OrthogonalLine(E, a)
i_1 = OrthogonalLine(P, a)
j_1 = OrthogonalLine(R, n)
S = Intersect(l, j_1)
T = Point(n)
U = Point(a_1)
V = Point(b_1)
W = Point(c_1)
Z = Point(d_1)
A_1 = Point(e_1)
B_1 = Point(f_1)
C_1 = Point(g_1)
D_1 = Point(h_1)
E_1 = Point(i_1)
k_1 = OrthogonalLine(Q, a)
F_1 = Point(k_1)
l_1 = OrthogonalLine(T, a_1)
m_1 = OrthogonalLine(U, b_1)
n_1 = OrthogonalLine(V, c_1)
p_1 = OrthogonalLine(W, c_1)
q_1 = OrthogonalLine(Z, d_1)
r_1 = OrthogonalLine(A_1, e_1)
s_1 = OrthogonalLine(B_1, f_1)
t_1 = OrthogonalLine(C_1, g_1)
a_2 = OrthogonalLine(D_1, h_1)
b_2 = OrthogonalLine(E_1, i_1)
c_2 = OrthogonalLine(F_1, k_1)
G_1 = Intersect(l, l_1)
H_1 = Intersect(l, m_1)
I_1 = Intersect(l, n_1)
J_1 = Intersect(l, p_1)
K_1 = Intersect(l, q_1)
L_1 = Intersect(l, r_1)
M_1 = Intersect(l, s_1)
N_1 = Intersect(l, t_1)
O_1 = Intersect(l, a_2)
P_1 = Intersect(l, b_2)
Q_1 = Intersect(l, c_2)
d_2 = Segment(J, T)
e_2 = Segment(K, U)
f_2 = Segment(D, V)
g_2 = Segment(L, W)
h_2 = Segment(M, Z)
i_2 = Segment(C, A_1)
j_2 = Segment(N, B_1)
k_2 = Segment(O, C_1)
l_2 = Segment(E, D_1)
m_2 = Segment(P, E_1)
n_2 = Segment(Q, F_1)
u = Vector(R, S)
v = Vector(T, G_1)
w = Vector(U, H_1)
z = Vector(V, I_1)
u_1 = Vector(W, J_1)
v_1 = Vector(Z, K_1)
w_1 = Vector(A_1, L_1)
z_1 = Vector(B_1, M_1)
u_2 = Vector(C_1, N_1)
v_2 = Vector(D_1, O_1)
w_2 = Vector(E_1, P_1)
z_2 = Vector(F_1, Q_1)
p_2 = Segment(B, Q_1)
text4: "Deposit = " + Deposit
text5: "Deposit = " + Deposit
text6: "Deposit = " + Deposit
text7: "Deposit = " + Deposit
text8: "Deposit = " + Deposit
text9: "Deposit = " + Deposit
text10: "Deposit = " + Deposit
text11: "Deposit = " + Deposit
text12: "Deposit = " + Deposit
text13: i + ""
q_2: y = Deposit + Deposit Interest / 100 * 0.81 * 11 / 12
text14: q_2 + ""
r_2: y = Deposit + Deposit Interest / 100 * 0.81 * 10 / 12
text15: r_2 + ""
s_2: y = Deposit + Deposit Interest / 100 * 0.81 * 9 / 12
text16: s_2 + ""
t_2: y = Deposit + Deposit Interest / 100 * 0.81 * 8 / 12
text17: t_2 + ""
a_3: y = Deposit + Deposit Interest / 100 * 0.81 * 7 / 12
text18: a_3 + ""
b_3: y = Deposit + Deposit Interest / 100 * 0.81 * 6 / 12
text19: b_3 + ""
c_3: y = Deposit + Deposit Interest / 100 * 0.81 * 5 / 12
text20: c_3 + ""
d_3: y = Deposit + Deposit Interest / 100 * 0.81 * 4 / 12
text21: d_3 + ""
e_3: y = Deposit + Deposit Interest / 100 * 0.81 * 3 / 12
text22: e_3 + ""
f_3: y = Deposit + Deposit Interest / 100 * 0.81 * 2 / 12
text23: f_3 + ""
g_3: y = Deposit + Deposit Interest / 100 * 0.81 * 1 / 12
text24: g_3 + ""
o_1 = false
o = false
o_2 = false
h_3 = false
i_3 = false
j_3 = false
k_3 = false
l_3 = false
m_3 = false
n_3 = false
o_3 = false
p_3 = false
q_3: y = Deposit * (12 + Interest / 100 * 0.81 * 78 / 12)
text25: q_3 + ""
r_3 = false