AHSME 1952 Problem 4

The cost $C$ of sending a parcel post package weighing $P$ pounds, $P$ an integer, is $10$ cents for the first pound and $3$ cents for each additional pound. The formula for the cost is: $\textbf{(A) \ }C=10+3P \textbf{(B) \ }C=10P+3 \textbf{(C) \ }C=10+3(P-1)$ $\textbf{(D) \ }C=9+3P \textbf{(E) \ }C=10P-7$