New York City’s consumer affairs department says hundreds of city supermarkets were found to have violated tax and pricing rules.

City inspectors surveyed more than 700 grocery stores and discovered that many weren’t abiding by a rule requiring a price tag for every item on the shelf.

Others rang up items at the wrong price. Nearly half didn’t calculate taxes properly, including wrongly including bottle deposits in an item’s taxable price.

The compliance rate was worst at stores in the city’s poorest neighborhoods.

Consumer Affairs Commissioner Jonathan Mintz says his department will double the number of inspectors next year.