What is the surface divergence or convergence if the vertical velocity at the Level of Non-divergence is -16.2 cm s^-1?

Constraints (listed in the handout discussing the simplified equation of continuity and Dine's Compensation or discussed in class):

· The vertical velocities at the Tropopause and at the surface (1000 mb) are zero.
· The Level of Non-divergence is at, roughly, the 500 mb level.