# Python program to calculate simple interest using function

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```def interest(principal, time=2, rate=0.10):
return principal*rate*time
#_____main_______
prin=float(input("Enter principal amount: "))
print("Simple interest with default ROI and time values is: ")
si1=interest(prin)
print("Rs.",si1)
roi=float(input("Enter rate of interest (ROI): "))
time=int(input("Enter time in years: "))
print("Simple interest with your provided ROI and time values is: ")
si2=interest(prin,time,roi/100)
print("Rs.",si2)

Output 1:
Enter principal amount: 8300
Simple interest with default ROI and time values is:
Rs. 1660.0
Enter rate of interest (ROI): 7
Enter time in years: 5
Simple interest with your provided ROI and time values is:
Rs. 2905.0
Output 2:
Enter principal amount: 25000
Simple interest with default ROI and time values is:
Rs. 5000.0
Enter rate of interest (ROI): 8
Enter time in years: 2
Simple interest with your provided ROI and time values is:
Rs. 4000.0```

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