Ruby program to calculate discount

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Following program shows you how to calculate discount.
In this program we get bill amount and discount from user and shows after discount amount using following formula
Discount = bill - (bill * discount / 100)

puts "Enter bill amount:"
 bill = Integer(gets.chomp)
 puts "Enter discount percentage:"
 discount = Integer(gets.chomp)
 afterDiscount = bill - (bill * discount / 100)
 puts "After discount your bill is: #{afterDiscount}"

Output:

Enter bill amount:
1000
Enter discount percentage:
20
After discount your bill is: 800
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