input: Write a python function to calculate the simple interest for given loan amount, interest rate, and number of years.
  assert calculate_simple_interest(1000, 5, 10) == 500.0
  assert calculate_simple_interest(1500, 4.5, 5) == 337.5
  assert calculate_simple_interest(2000, 3, 7) == 420.0
output: def calculate_simple_interest(principal, rate, time):
      return (principal * rate * time) / 100