set the dollar amount

assets/javascripts/discourse/models/plan.js.es6

@@ -2,10 +2,16 @@ import computed from "ember-addons/ember-computed-decorators";
 import { ajax } from "discourse/lib/ajax";
 
 const Plan = Discourse.Model.extend({
-  @computed("amount")
-  amountDollars(amount) {
-    return parseFloat(amount / 100).toFixed(2);
-  },
+  amountDollars: Ember.computed("amount", {
+    get() {
+      return parseFloat(this.get("amount") / 100).toFixed(2);
+    },
+    set(key, value) {
+      const decimal = parseFloat(value) * 100;
+      this.set("amount", decimal);
+      return value;
+    }
+  }),
 
   @computed("amountDollars", "currency", "interval")
   subscriptionRate(amountDollars, currency, interval) {

assets/javascripts/discourse/templates/admin/plugins-discourse-patrons-products-show-plans-show.hbs

@@ -22,7 +22,7 @@
   </p>
   <p>
     <label for="amount">{{i18n 'discourse_patrons.admin.plans.plan.amount'}}</label>
-    {{input type="text" name="name" value=model.plan.amount disabled=planFieldDisabled}}
+    {{input type="text" name="name" value=model.plan.amountDollars disabled=planFieldDisabled}}
   </p>
   <p>
     <label for="trial">