On April 1 of this year, Mr. X sold a parcel of land, a capital property with an adjusted cost base of $100,000, for $600,000. The $600,000 proceeds were payable in the form of a mortgage, with principal payments of $90,000 due every six months, starting on October 1 of this year. Required: What is the minimum taxable capital gain that Mr. X must report in the current year using the capital gain reserve provision?