trying to fix price

models/data.go

@@ -5,7 +5,7 @@ import "time"
 type Cake struct {
 	Name   string
 	ID     int
-	Price  int // increments of 0.01
+	Price  Price // increments of 0.01
 	Amount int
 }
 
@@ -18,18 +18,22 @@ type Order struct {
 	Date     time.Time
 	Accepted time.Time
 	Status   string
-	Paid     int // increments of 0.01
+	Paid     Price // increments of 0.01
 	Cakes    []Cake
 }
 
-func (o *Order) Total() int {
-	out := o.Paid * (-1)
+func (o *Order) Subtotal() Price {
+	var out Price
 	for _, e := range o.Cakes {
-		out += e.Price * e.Amount
+		out += e.Price * Price(e.Amount)
 	}
 	return out
+
+}
+func (o *Order) Total() Price {
+	return o.Subtotal() - o.Paid
 }
 
-func (c *Cake) Total() int {
-	return c.Amount * c.Price
+func (c *Cake) Total() Price {
+	return Price(c.Amount) * c.Price
 }