Final answer:
Khalid's entire weekly gross salary of $702 is taxable. No deductions or non-taxable amounts were mentioned, so the whole salary is subject to tax.
Step-by-step explanation:
The question asks to determine how much of Khalid Khouri's weekly salary is taxable. According to the information provided, Khalid earns a gross weekly salary of $702, and it is stated that all of this is taxable. Therefore, the entire amount of $702 is subject to tax.
Since there is no mention of any deductions or non-taxable income, nor any additional details that would alter the taxable amount, the answer to how much of Khalid's salary is taxable is simply the full amount of his gross salary.