The country of Aquilonia has a tax system identical to that of Canada. Suppose someone in Aquilonia bought a parcel of land for $20 000 in 1960 when the price index equalled 100. In 2002, the person sold the land for $100 000, and the price index equalled 600. If the person must pay 20 percent of any capital gain in taxes, which of the following is the after-tax real capital gain (in 2002 dollars) on the land?