JAMB 1997 · UME · Q1

The place values in base four are 64, 16, 4 and 1, so $1P03_4 = 64 + 16P + 0 + 3$.

Set it equal to 115: $67 + 16P = 115$, so $16P = 48$.

So $P = 3$, option D.