Calculate the dollar rates of return on the following assets:

a. A painting whose price rises from $200,000 to $250,000 in a year.

b. A bottle of a rare Burgundy, Domaine de la Romane-Conti 1978, whose price rises from $225 to $275 between 2010 and 2011.

c. A 10,000 deposit in a London bank in a year when the interest rate on pounds is 10 percent and the $/ exchange rate moves from $1.50 per pound to $1.38 per pound.