Compute the missing amount for each of the following notes:

Principal	Annual Interest Rate	Time	Total Interest
(a)	$50,000	5%	2.5	years	$
(b)	$120,000	%	9	months	$7,200
(c)	$	9%	90	days	$1,350
(d)	$60,000	6%		months	$1,200