  A sum rule relating the ratio $R_c = 2 \Gamma(B^+ \to K^+ \pi^0)/\Gamma(B^+
\to K^0 \pi^+)$ and the CP asymmetry $A_{CP}(B^+ \to K^+\pi^0)$ is proved to
first order in the ratio of tree to penguin amplitudes. The sum rule explains
why it is possible to have $R_c$ consistent with 1 together with a small CP
asymmetry in $B^+ \to K^+ \pi^0$. The measured ratio $A_{CP}(B^+\to
K^+\pi^0)/A_{CP}(B^0\to K^+\pi^-)$ rules out a small strong phase difference
between a color-suppressed and a color-favored tree amplitude contributing to
$B^+\to K^+\pi^0$ as favored by QCD factorization.
