Net income
Net income was $129.7 million for the 13 weeks ended November 2, 2019, compared to $131.2 million for the 13 weeks ended November 3, 2018. The decrease in net income is primarily related to the $53.7 million increase in SG&A expenses partially offset by a $51.2 million increase in gross profit.
Comparison of 39 weeks ended November 2, 2019 to 39 weeks ended November 3, 2018
Net sales
Net sales increased $500.3 million or 10.9%, to $5,092.2 million for the 39 weeks ended November 2, 2019, compared to $4,591.9 million for the 39 weeks ended November 3, 2018. Comparable stores contributed $244.9 million of the total net sales increase and non-comparable stores contributed $243.0 million of the total net sales increase. Other revenue increased $12.4 million compared to the 39 weeks ended November 3, 2018.
The total comparable sales increase of 5.4% included a 4.0% increase in transactions and a 1.4% increase in average ticket. We attribute the increase in comparable sales to our successful marketing and merchandising strategies.
Gross profit
Gross profit increased $205.7 million or 12.3%, to $1,874.2 million for the 39 weeks ended November 2, 2019, compared to $1,668.5 million for the 39 weeks ended November 3, 2018. Gross profit as a percentage of net sales increased 50 basis points to 36.8% for the 39 weeks ended November 2, 2019, compared to 36.3% for the 39 weeks ended November 3, 2018. The increase in gross profit margin was primarily due to improvement in merchandise margins driven by marketing and merchandising strategies and leverage in fixed store costs, partially offset by investments in salon services and supply chain operations.
Selling, general and administrative expenses
SG&A expenses increased $167.0 million or 15.5%, to $1,245.2 million for the 39 weeks ended November 2, 2019, compared to $1,078.2 million for the 39 weeks ended November 3, 2018. SG&A expenses as a percentage of net sales increased 100 basis points to 24.5% for the 39 weeks ended November 2, 2019, compared to 23.5% for the 39 weeks ended November 3, 2018. The increase is primarily due to deleverage in corporate overhead related to investments in growth initiatives and store labor, partially offset by leverage in marketing expense.
Pre-opening expenses
Pre-opening expenses decreased $1.7 million to $15.7 million for the 39 weeks ended November 2, 2019, compared to $17.4 million for the 39 weeks ended November 3, 2018. During the 39 weeks ended November 2, 2019, we opened 73 new stores and remodeled 12 stores, and relocated six stores, compared to the 39 weeks ended November 3, 2018, when we opened 95 new stores, remodeled 13 stores, and relocated two stores.
Interest income, net
Interest income, net was $4.6 million for the 39 weeks ended November 2, 2019 compared to $3.8 million for the 39 weeks ended November 3, 2018. Interest income results from cash equivalents and short-term investments with maturities of twelve months or less from the date of purchase. Interest expense represents interest on borrowings and fees related to the credit facility. We did not have any outstanding borrowings on our credit facility as of November 2, 2019 and November 3, 2018.
Income tax expense
Income tax expense of $134.7 million for the 39 weeks ended November 2, 2019 represents an effective tax rate of 21.8%, compared to $132.8 million of tax expense representing an effective tax rate of 23.0% for the 39 weeks ended November 3, 2018. The lower effective tax rate is primarily due to income tax accounting for share-based compensation and federal income tax credits.