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

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+importance: 5
+
+---
+
+# Deposit calculator
+
+Create an interface that allows to enter a sum of bank deposit and percentage, then calculates how much it will be after given periods of time.
+
+Here's the demo:
+
+[iframe src="solution" height="350" border="1"]
+
+Any input change should be processed immediately.
+
+The formula is:
+```js
+// 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));
+```