Fix compound interest formula

https://en.wikipedia.org/wiki/Compound_interest

Author: shvchk

2-ui/4-forms-controls/3-events-change-input/1-deposit-calculator/solution.view/index.html

@@ -96,7 +96,7 @@
       let years = form.months.value / 12;
       if (!years) return;
 
-      let result = Math.round(initial * (1 + interest * years));
+      let result = Math.round(initial * (1 + interest) ** years);
 
       let height = result / form.money.value * 100 + 'px';
       document.getElementById('height-after').style.height = height;

2-ui/4-forms-controls/3-events-change-input/1-deposit-calculator/task.md

@@ -17,5 +17,5 @@ The formula is:
 // initial: the initial money sum
 // interest: e.g. 0.05 means 5% per year
 // years: how many years to wait
-let result = Math.round(initial * (1 + interest * years));
+let result = Math.round(initial * (1 + interest) ** years);
 ```