17 A commodity investor bought fully collateralized April contracts in a commodity on 1 March with the intent to roll them into May contracts on 1 April. The details of the trade are presented below.

	1 March	1 April
April contract price	14.70	15.20
May contract price	14.60	14.80
Annual interest rate on government bills	3.6%	3.6%

The investor's total return for March was closest to: