Replacing the given values in formula (a) we have:
Amount Saved = Original Price x Discount in Percent / 100. So,
Amount Saved = 1/2 x 20 / 100
Amount Saved = 10 / 100
Amount Saved = €0.1 (answer).
In other words, a 20% discount for an item with an original price of €1/2 is equal to €0.1 (Amount Saved).
Note that to find the amount saved, just multiply it by the percentage and divide by 100.