diff --git a/code/06-finished/src/components/Chart/Chart.js b/code/06-finished/src/components/Chart/Chart.js
index e9fb675880..5c8d97c201 100644
--- a/code/06-finished/src/components/Chart/Chart.js
+++ b/code/06-finished/src/components/Chart/Chart.js
@@ -4,8 +4,9 @@ import ChartBar from './ChartBar';
 import './Chart.css';
 
 const Chart = (props) => {
-  const dataPointValues = props.dataPoints.map(dataPoint => dataPoint.value);
-  const totalMaximum = Math.max(...dataPointValues);
+  let total = 0;
+  for(let v of props.dataPoints)
+    total += parseFloat(v.value);
 
   return (
     <div className='chart'>
@@ -13,7 +14,7 @@ const Chart = (props) => {
         <ChartBar
           key={dataPoint.label}
           value={dataPoint.value}
-          maxValue={totalMaximum}
+          totalValue={total}
           label={dataPoint.label}
         />
       ))}
diff --git a/code/06-finished/src/components/Chart/ChartBar.js b/code/06-finished/src/components/Chart/ChartBar.js
index 006be7eb0a..6a4b691656 100644
--- a/code/06-finished/src/components/Chart/ChartBar.js
+++ b/code/06-finished/src/components/Chart/ChartBar.js
@@ -5,8 +5,8 @@ import './ChartBar.css';
 const ChartBar = (props) => {
   let barFillHeight = '0%';
 
-  if (props.maxValue > 0) {
-    barFillHeight = Math.round((props.value / props.maxValue) * 100) + '%';
+  if (props.totalValue > 0) {
+    barFillHeight = Math.round((props.value / props.totalValue) * 100) + '%';
   }
 
   return (