costs = [159, 20.99, 13.21, 67]

print('--- Costs in this month ---')
print(costs)
print(f'Number of costs: {len(costs)}')
print(f'Sum of costs: {sum(costs):.2f}')
print(f'Minimum of costs: {min(costs)}')
print(f'Maximum of costs: {max(costs)}')

sUm = 0
for c in costs:
    print(f'Current sum: {sUm:.2f}')
    sUm = sUm + c
print(f'Manualcalculated sum: {sUm:.2f}')