2D array address calculation question say A[5][5] was created

int A[5][5];

base address for A[0][0] is 100, element size is 1 ,number of element 5

What is address of A[4][4]?

What is address of A[4][4] when base address is now A[1][1] = 100?

This is what i got

address = 100 + 1((5*4)+4)=124

address = 100 + 1((5*(4-1))+(4-1)=118