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Suppose we have some parameters P,O,E,T. If we have P dollars in principal that we want to invest the stock market. The stock market alternates between first returning E and then O percent interest per year, we have to check how many years it would take to reach at least T dollars.

So, if the input is like P = 200, O = 10, E = 25, T = 300, then the output will be 3 as in the first year we will get interest 25%, so end up with 200+50 = 250, then next year we will get 10%, so end up with 250+25 = 275, then again get 10% in the next year, so it will be 275+27.5 = 302.5, this is greater than 300, so 3 years required.

To solve this, we will follow these steps −

- ans:= 0
- while P < T, do
- P := P * 1+(E/100)
- ans := ans + 1
- if P < T, then
- P := P * 1+(O/100)
- ans := ans + 1

- return ans

Let us see the following implementation to get better understanding −

class Solution: def solve(self, P, O, E, T): ans=0 while P < T: P *= 1+(E/100) ans += 1 if P < T: P *= 1+(O/100) ans += 1 return ans ob = Solution() P = 200 O = 10 E = 25 T = 300 print(ob.solve(P,O,E,T))

P = 200, O = 10, E = 25, T = 300

3

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