Calculate discount of equal installments with zero interest

main.py

YEARLY_INTEREST = 0.1375
MONTHLY_INTEREST = ((1 + YEARLY_INTEREST) ** (1/12)) - 1
NUM_INSTALLMENTS = 12

print("+--------------+----------+")
print("| Installments | Discount |")
print("+--------------+----------+")

installments = [1.0]
for num_installments in range(1, NUM_INSTALLMENTS + 1):
    print("| {:12d} | {:7.3f}% |".format(num_installments, 100 * (1 - sum(installments) / num_installments)))
    installments.append(installments[-1] / (1 + MONTHLY_INTEREST))

print("+--------------+----------+")