Compound Interest
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Calculate the Compund interest for given principal amount P , time T(in years), compounded N times in a year at rate R. Calculate floor of future value of given principal amount.

Example 1:

Input:
P = 1000 , T = 2 , N = 2 , R = 10
Output:
1215
Explanation:
The given Principal, Time, Rate and
number of compounds in a year results
in a Compound Interest of 1215.51.
The floor value being 1215, Output is 1215.

Example 2:

Input:
P = 100 , T = 1 , N = 1 , R = 10
Output:
110
Explanation:
The given Principal, Time, Rate and
number of compounds in a year results
in a Compound Interest of 110.
So, the Output is 110.

You don't need to read input or print anything. Your task is to complete the function getCompundInterest() which takes Integers P,T,N and R as input respectively and returns the answer.

Expected Time Complexity: O(log(N*T))
Expected Auxiliary Space: O(1)

Constraints:
1 <= P <= 1000
1 <= T <= 20
1 <= N <= 4
1 <= R <= 20