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Exercise prompt
Update a Balance
The operators += and -= are concise ways to update a number using its
current value. balance += 10 means the same as balance = balance + 10.
Example
let points = 20;
points += 5;
points -= 2;The final value is 23. Your exercise updates an account balance.
Your task
The balance starts at 100. Deposit 25 with +=, then spend 40 with -=. The console should display Balance: 85.