# Functions that Modify Parameters¶

In [2]:
def add_interest(balance, rate):
new_balance = balance * (1 + rate)
return new_balance

In [4]:
add_interest(1_000_000.00, 0.05)

Out[4]:
1050000.0
In [6]:
def add_interest2(balance, rate):
new_balance = balance * (1 + rate)
balance = new_balance

In [9]:
my_bal = 1_000_000.00
interest = 0.05

print(my_bal)

None
1000000.0


## SOmething¶

In [12]:
def add_interest(balance, rate):
new_balance = balance * (1 + rate)
balance = new_balance

In [13]:
def test():
amount = 1000
rate = 0.05
print(amount)

In [14]:
test()

1000


## Adding interest to multiple accounts¶

In [25]:
def add_interest(balances, rate):
for i in range(len(balances)):
balances[i] = balances[i] * (1+rate)

In [26]:
def add_interest_2(balances, rate):
new_balances = []
for i in range(len(balances)):
new_balances.append(balances[i] * (1+rate))
balances = new_balances
return balances

In [27]:
def test():
amounts = [1000, 2200, 800, 360]
rate = 0.05

print(amounts)

test()

[1000, 2200, 800, 360]