### Instruction: a certain sum is invested at simple interest at 15 % p . a . for two years instead of investing at 12 % p . a . for the same time period . therefore the interest received is more by rs . 420 . find the sum ? Let's write a Python program.### Response: n0 = 15.0
n1 = 12.0
n2 = 420.0
t0 = n0 - n1
t1 = t0 * 2.0
t2 = t1 / 100.0
answer = n2 / t2
print(answer)