Problem $1$

For this exercise you will write three functions

The first function called calculate$\_$interest will calculate the interest and return it$.$

The second function is called make$\_$withdrawal will perform withdrawal and return the new balance if the withdrawal is successful, otherwise $-1.$

The third function is called make$\_$deposit will perform diposit and return the new balance if the deposit is successful, otherwise $-1.$

Interest formula:

interest $=($principal $*$ rate $*$ time$)/100\mathrm{.}0$

$"""$

# $!!$ DON'T CHANGE THE TEMPLATES BELOW. WRITE THE SOLUTIONS FOR THE GIVEN FUNCTIONS $!!$

# Initialize a global constant Rate

RATE $=4\mathrm{.}5$

# Function to calculate new interest

def calculate$\_$interest$($principal$,$ time$)$:

# Write your logic for this function here.

interest $=($principal $*$ RATE $*$ time$)/100\mathrm{.}0$

return interest

# Function to calculate new balance after a withdrawal

def make$\_$withdrawal$($balance$,$ amount$)$:

# Write your logic for this function here.

if amount $<=$ balance:

balance $-=$ amount

return balance

else:

return $-1$

# Function to calculte new balance after a deposite

def make$\_$deposit$($balance$,$ amount$)$:

# Write your logic for this function here.

if amount $>0$:

balance $+=$ amount

return balance

else:

return $-1$

Problem $2$

Describe your program here.

Write a function that take three inputs num$1,$ num$2,$ and op and performs arithmetic operations such as addition$(+),$ subtraction$(-),$ multiplication$(*),$ and division$(/).$ Your program must return the operation results based on the operator specified by the op variable.

Input:

perform$\_$arithmetic$\_$operations$(8,9,+)$

Output:

$17.$

Input:

perform$\_$arithmetic$\_$operations$(-8,3,*)$

Output:

$-24.$

Input:

perform$\_$arithmetic$\_$operations$($b$,9,+)$

Output:

Invalid input!.

Input:

perform$\_$arithmetic$\_$operations$(4,9,$ ~$)$

Output:

Unknown operator!

Input:

perform$\_$arithmetic$\_$operations$(4,0,/)$

Output:

Impossible operation!

Variables: num$1,$ num$2,$ op

$"""$

# Write the function here

def perform$\_$arithmetic$\_$operations$($num$1,$ num$2,$ op$)$:

# Write your function body here.

try:

num$1=$ float$($num$1)$

num$2=$ float$($num$2)$

except ValueError:

return "Invalid input!"

# Perform the operation based on the operator

if op $==\text{'}+\text{'}$:

return num$1+$ num$2$

elif op $==\text{'}-\text{'}$:

return num$1-$ num$2$

elif op $==\text{'}*\text{'}$:

return num$1*$ num$2$

elif op $==\text{'}/\text{'}$:

if num$2==0$:

return "Impossible operation!"

return num$1/$ num$2$

else:

return "Unknown operator!"