Exercise 1.7

src/index.js

@@ -21,6 +21,23 @@ class App extends React.Component {
                     return () => {this.setState({ bad: this.state.bad + 1 })}
             }
         }
+        const mean = () => {
+            if (this.state.good === 0 && this.state.neutral === 0 && this.state.bad === 0) {
+                return 0
+            } else {
+                return (
+                    (this.state.good - this.state.bad) / (this.state.good + this.state.neutral + this.state.bad)
+                )
+            }
+        }
+        const positivePercentage = () => {
+            if (this.state.good === 0) {
+                return 0
+            } else {
+                return this.state.good / (this.state.good + this.state.neutral + this.state.bad)
+            }
+        }
+
         return (
             <div>
                 <h2>anna palautetta</h2>
@@ -32,6 +49,8 @@ class App extends React.Component {
                 <p>Hyvä: {this.state.good}</p>
                 <p>Neutraali: {this.state.neutral}</p>
                 <p>Huono: {this.state.bad}</p>
+                <p>Keskiarvo: {mean()} </p>
+                <p>Positiivisia: {positivePercentage()}%</p>
             </div>
         )
     }