diff --git a/apps/pr-reviewer/fixtures/demo-pr/cart-total.test.ts b/apps/pr-reviewer/fixtures/demo-pr/cart-total.test.ts
index ba32b97..213a945 100644
--- a/apps/pr-reviewer/fixtures/demo-pr/cart-total.test.ts
+++ b/apps/pr-reviewer/fixtures/demo-pr/cart-total.test.ts
@@ -63,4 +63,13 @@ describe('cartTotal', () => {
   it('handles large quantities', () => {
     expect(cartTotal([{ price: 3, qty: 1_000_000 }])).toBe(3_000_000);
   });
+
+  it('rounds each line to whole cents', () => {
+    expect(
+      cartTotal([
+        { price: 33.3, qty: 3 },
+        { price: 10.4, qty: 1 },
+      ]),
+    ).toBe(110);
+  });
 });
diff --git a/apps/pr-reviewer/fixtures/demo-pr/cart-total.ts b/apps/pr-reviewer/fixtures/demo-pr/cart-total.ts
index c694360..d80aa50 100644
--- a/apps/pr-reviewer/fixtures/demo-pr/cart-total.ts
+++ b/apps/pr-reviewer/fixtures/demo-pr/cart-total.ts
@@ -4,7 +4,7 @@ export function cartTotal(items: { price: number; qty: number }[]): number {
     if (items[i].qty < 0) {
       throw new RangeError(`Negative quantity for item ${i}`);
     }
-    total += items[i].price * items[i].qty;
+    total += Math.round(items[i].price * items[i].qty);
   }
   return total;
 }