Online giant Amazon reported a 16% rise in third-quarter profit, as its e-book reader Kindle bolsters sales.

Amazon reported a profit of $231m (£147m) in the three months to September, up from $199m it reported in the same period a year earlier.

Revenues sold 39% to $7.56bn.

The etailer said total operating expenses rose more than 40% to $7.29bn.

Kindle launched in the US in 2007, and in the UK in 2009. It has become Amazon’s fastest-selling and best-selling item.

Amazon said it expected sales in the last three months of the year to be between $12bn and $13.3bn, growth of between 26% and 40%.