Ruby program to calculate interest

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Following program shows you how to calculate interest.
In this program we get investment, interest rate and time from user and calculate interest using following formula
Interest = investment X interestRate X time / 100

 puts "Enter investment:"
 investment = Integer(gets.chomp)
 puts "Enter interest rate:"
 interestRate = Integer(gets.chomp)
 puts "Enter number of years:"
 time = Integer(gets.chomp)
 interest = investment * interestRate * time / 100
 puts "Interest amount is: #{interest}"


Enter investment:
Enter interest rate:
Enter number of years:
Interest amount is: 48000
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