diff --git a/apps/pr-reviewer/fixtures/demo-pr/currency.ts b/apps/pr-reviewer/fixtures/demo-pr/currency.ts
index 21caeeb..2188de4 100644
--- a/apps/pr-reviewer/fixtures/demo-pr/currency.ts
+++ b/apps/pr-reviewer/fixtures/demo-pr/currency.ts
@@ -1,3 +1,12 @@
 export function formatUsd(cents: number): string {
   return "$" + cents / 100;
 }
+
+const ZERO_DECIMAL_CURRENCIES = new Set(["JPY", "KRW", "VND"]);
+
+export function formatAmount(minorUnits: number, currency: string): string {
+  if (ZERO_DECIMAL_CURRENCIES.has(currency)) {
+    return `${minorUnits} ${currency}`;
+  }
+  return `${(minorUnits / 100).toFixed(2)} ${currency}`;
+}