0.58x- 1 1.5

0.83x- 1 1 1.5

Solution: (1)① When x is less than or equal to 230, y = 0.93x

② when x is greater than 230 and less than or equal to 000, y = 0.98 (x-230)+0.93× 230 = 0.98 x-11.9;

③ When x is greater than 000, y = 0.83 (x-000)+0.98× (000-230)+0.93× 230 = 0.83 x-1.9;

So the answer is: 0.93x, 0.98x- 1 1.9, 0.83x-11.9;

(2)∵0.93×230+0.98×(000-230)

= 12 1.9+98.6

=220.9