The maximum tax-deductible RRSP contribution is calculated as 18% of the previous year’s earned income, minus the pension adjustment, plus any carry-forward contribution room. In this case:

(18% × $45,000) = $8,100

$8,100 - $2,500 (pension adjustment) + $2,000 (carry-forward) = $7,600.

The feedback from the document confirms:

"Joanne’s tax-deductible RRSP contribution room would be calculated as (18% × $45,000) - $2,500 + $2,000 = $7,600."