diff --git a/src/main/java/enzinium/TokenContract.java b/src/main/java/enzinium/TokenContract.java
index 5fe49c5..9b8d75a 100644
--- a/src/main/java/enzinium/TokenContract.java
+++ b/src/main/java/enzinium/TokenContract.java
@@ -12,6 +12,7 @@ public class TokenContract {
     private String symbol = null;
     private double totalSupply = 0d;
     private Double totalTokensSold = 0d;
+    private Double tokenPrice = 5d; 
 
     private Map<PublicKey, Double> balances = new HashMap<>(); 
 
@@ -56,6 +57,18 @@ public double totalSupply() {
         return this.totalSupply;
     }
 
+    public void setTokenPrice(Double tokenPrice) {
+        this.tokenPrice = tokenPrice;
+    }
+
+    public Double getTokenPrice() {
+        return this.tokenPrice;
+    }
+
+    public void setBalances(Map<PublicKey, Double> balances) {
+        this.balances = balances;
+    }
+
     public Map<PublicKey, Double> getBalances() {
         return this.balances;
     }
@@ -131,10 +144,9 @@ public int totalTokensSold() {
     }
 
     public void payable(PublicKey recipient, Double enziniums) {
-        Double tokenPrice = 5d; 
         try {
-            require(enziniums >= tokenPrice);
-            Double units = enziniums / tokenPrice;
+            require(enziniums >= this.getTokenPrice());
+            Double units = Math.ceil(enziniums / tokenPrice);
             transfer(recipient, units);
             this.owner.transferEZI(enziniums);
         } catch (Exception e) {
diff --git a/src/test/java/enzinium/TokenContractTest.java b/src/test/java/enzinium/TokenContractTest.java
index 7b66d7d..644a69f 100644
--- a/src/test/java/enzinium/TokenContractTest.java
+++ b/src/test/java/enzinium/TokenContractTest.java
@@ -78,8 +78,16 @@ public void payable_test() {
         // verifico la transferencia de entradas
         ricknillos.payable(morty.getPK(), morty.getBalance());
         assertEquals(4d, ricknillos.balanceOf(morty.getPK()), 0d);   
-
         // verifico la trasnferencia de EZI
         assertEquals(20d, ricknillos.owner().getBalance(), 0d);
+
+        // sin EZI suficiente
+        ricknillos.payable(morty.getPK(), 4d);
+        assertEquals(4d, ricknillos.balanceOf(morty.getPK()), 0d);
+        assertEquals(20d, ricknillos.owner().getBalance(), 0d);
+
+        ricknillos.payable(morty.getPK(), 8d);
+        assertEquals(5d, ricknillos.balanceOf(morty.getPK()), 0d);
+        assertEquals(20d, ricknillos.owner().getBalance(), 0d);
     }
 }
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