The 7 must-know numbers of the week

The expected cost of the planned luxury Pinctada resort development on WA’s Rottnest Island, which will not be proceeding due to "constraints". Developer and former actor Marilynne Paspaley has abandoned plans for a resort on the island, saying outdated bureaucratic processes killed off her vision.

The amout of property tax that billionaire Warren Buffett pays each year. Buffett has lived in the same modest house in Omaha, Nebraska for a very long time. Forbes did the research after Buffett drew lots of attention to himself a few months ago, saying he paid a very low rate of income taxes as well.

The cost of Craig-y-Mor, the Point Piper house owned by Zeng Wei and his wife, Jiang Mei. Zeng Wei is the son of a former vice-president of China, and Chinese tourists have taken to driving past the house for a glimpse into the lives of the couple.

The amount that Yellow Brick Road founder Mark Bouris says Celebrity Apprentice saved the company. Bouris, who hosts the show, says Yellow Brick Road would have had to embark on a $50 million marketing campaign over an 18-month period to generate the increase in brand recognition the company has achieved following its close association with Channel 9’s Celebrity Apprentice.

The average amount of time it takes to sell a house in Australia, according to RP Data. A year ago it took an average of 46 days to sell a house

The number of Australians who have poured $26.9 million in the first round of a three-stage capital-raising exercise by Dixon Advisory's US Masters Fund, which buys investment properties in the American state of New Jersey. 

The amount that Australian residential property is overvalued, according to The Economist magazine. Australian house prices are more vulnerable to a major correction than the US housing market was before its collapse following the GFC, the magazine says.