(a) Convert 444₅ to a base two numeral

(b) A man had three GH¢ 50.00, seven GH¢ 20.00 and five GH¢ 10.00 notes in his pocket. If he bought a bicycle for GH¢150.00 and two mobile phones at GH¢ 80.00 each, how many GH¢ 20.00 and GH¢ 10.00 notes did he have left?