Dutch retailer Jumbo Supermarkten has booked a 35% increase in first-half sales.

The company said sales reached EUR1.2bn (US$1.76bn) in the first six months of the year.

Jumbo attributed the rise in sales to the conversion of almost 100 Super de Boer stores, a rival chain which it bought in 2009 in a deal worth EUR552.4m.

General director Frits van Eerd said: "The sales have increased, the conversion is progressing successfully and the integration is on track. It's good to see that Jumbo's formula of the lowest price, largest selection and best service once again proves its power to our customers."

He added that retail sales increased by between 50% and 100% in the first weeks after a shop's conversion.

Jumbo has expanded rapidly in recent years. The family business now has 227 stores and has become one of the largest supermarket chains in the Netherlands, with a market share of more than 7.5%.

The company is set to open its 250th supermarket in November and aims to have 300 by the end of the first half of 2012.

Eerd added: "Although the integration is certainly not an automatic process, we look back with satisfaction and ahead with anticipation."