diff --git a/src/main/java/com/f_lab/la_planete/domain/Food.java b/src/main/java/com/f_lab/la_planete/domain/Food.java
index b308666..7825b7b 100644
--- a/src/main/java/com/f_lab/la_planete/domain/Food.java
+++ b/src/main/java/com/f_lab/la_planete/domain/Food.java
@@ -47,7 +47,7 @@ public static Food of(BigDecimal price, int totalQuantity) {
   }
 
   public BigDecimal calculateCost(int quantity) {
-    return BigDecimal.valueOf((long) price.intValue() * quantity);
+    return price.multiply(BigDecimal.valueOf(quantity));
   }
 
   public void minusQuantity(int deductions) {