Xiao Li sent a box of cherries from Xi to his grandmother in Nanchang through a courier company. When delivering cherries, he learned that this company not only charges the packaging fee for each 6 yuan.
(1) from the meaning of the question, you get.
When 0 < x ≤ 1,
y = 22+6 = 28；
When x > 1
y = 28+ 10(x- 1)= 10x+ 18；
∴y=28(0 1)；
(2) When x=2.5,
y= 10×2.5+ 18=43。
The charge for this express delivery is 43 yuan.