Please debug the C$++$code showed below,thanks!

using namespace std;

int main$()\{$

cout $<<$ "Welcome to your first C$++$ lab!" $<<$ endl;

cout $<<"$In this program, let's pretend you want to buy C$++$ learning materials." $<<$ endl;

cout $<<$ "After fixing the codes below, compare this program output with the sample output to verify your work." $<<$ endl;

cout $<<$ endl;

int balance;

cout $<<$ "Please enter the amount of money you have: $"$;

cin $>>$ balance;

$//$ TODO $1$: Fix the line below. It currently will print "You have$500$HKD$."$ if your input was $500.$

$//$ For details, check the expected output below

cout $<<$ "You have" $<<$ balance $<<"$HKD$."<<$ endl;

cout $<<$ endl;

cout $<<$ "You decide to buy the textbook for $100$ HKD$."<<$ endl;

$//$ TODO $2$: Fix the line below. It currently does not subtract balance by $100$ correctly.

balance $-100$;

cout $<<$ "Remaining balance: $"<<$ balance $<<"$ HKD$."<<$ endl;

cout $<<$ endl;

$//$ TODO $3$: Fix the three lines below. They are not in the correct order,

$//$ which causes the output does not reflect the real current remaining balance correctly

cout $<<$ "You decide to buy a notebook for $20$ HKD$."<<$ endl;

cout $<<$ "Remaining balance: $"<<$ balance $<<"$ HKD$."<<$ endl;

balance $=$ balance $-20$;

cout $<<$ endl;

cout $<<$ "Because you need money, you would like to sell your pencil." $<<$ endl;

int price;

cout $<<$ "Please enter the price for your pencil: $"$;

cin $>>$ price;

$//$ TODO $4$: Fix the if statement below.

$//$ The shop allows you to sell a pencil, but the price cannot be higher than $50$

$//$ Hint: Do you use the correct variable in the following if statement?

if $($balance $<=50)$

cout $<<$ "The price $"<<$ balance $<<"$ is too high, you could not sell your pencil." $<<$ endl;

else

balance $=$ balance $+$ price;

cout $<<$ "Remaining balance: $"<<$ balance $<<"$ HKD$."<<$ endl;

cout $<<$ endl;

cout $<<$ "Lastly, you try to buy a new laptop for $2000$ HKD$."<<$ endl;

$//$ TODO $5$: Fix the if statement below.

$//$ Currently if the user does not have enough money, it is still subtracted.

$//$ Hint: C$++$ is strict with curly braces.

if $($balance $<2000)$

cout $<<$ "You don't have enough money left." $<<$ endl;

else

cout $<<$ "You have enough money left, you can purchase the laptop." $<<$ endl;

balance $=$ balance $-2000$;

cout $<<$ "Remaining balance: $"<<$ balance $<<"$ HKD$."<<$ endl;

return $0$;

$\}$