diff --git a/usertool.js b/usertool.js
index 01f1146..6aacc95 100644
--- a/usertool.js
+++ b/usertool.js
@@ -456,12 +456,12 @@ export default {
     }
   },
 
-  formatMoney(value, decimal) {
-    return Number(value || 0).toFixed(decimal || 2) // Number(undefined)===NaN
+  formatMoney(value, precision=2) {
+    return Number(value || 0).toFixed(precision) // Number(undefined)===NaN
   },
 
-  formatPercent(value, decimal) {
-    return Number(value * 100 || 0).toFixed(decimal || 2)
+  formatPercent(value, precision=2) {
+    return Number(value * 100 || 0).toFixed(precision)
   },
 
   formatDate(date, format) {