Solution

K = float(input("Starting capital? "))

p = float(input("Interest rate? "))

n = int(input("Number of years? "))

# python2: raw_input instead of input

i = 0

while i < n:

K += K * p / 100.0

# or K *= 1 + p / 100.0

i += 1

print(i)

print("Capital after " + str(n) + " ys: " + str(K))