N is employed as a salesperson and received $70,000 in commissions in the current year. N spends most of the time working in her home office. N paid $1,200 including 13% HST in computer lease payments in the current year. N estimates that the computer is used 90% for employment purposes. What is the maximum deduction from employment income for tax purposes available to N for the current year?

Note: Do not place a minus sign in front of the amount.
$ .

Show all calculations.