Predict based on regression model

Hi,

I estimated on the regression model:

Code:

reg lnChild lnCash lnWhite lnCash*lnWhite

Based on this regression, I want to predict the outcome using the mean values of the independent variables.

For instance, I want to plug in the average of Cash on this regression to see how it differs to the real # of children.

Do you have any ideas how to do this?

Thank you in advance!