Feeling a bit peckish?

[P5/6 Maths: Part-Whole Relationships]

Here's a quick teaser:

Steve spent 5/8 of his allowance on 15 meat pies and 10 quiches. After spending another $14.50, he bought the same number of meat pies and quiches. A quiche costs 50 cents more than a meat pie.

a) Find the cost of a meat pie. b) How much allowance does Steve have at first?