  The problem of estimation of the proportion of units with a given attribute
in a~finite population is considered. From the population a sample is drawn due
to the simple random sampling without replacement. There are limited funds for
conducting survey sample. Suppose that the population is divided into two
strata. The question now arises: how should sample sizes be chosen from each
strata to obtain the best estimation of proportion without exceeding the budget
planned. In the paper it is shown, that with the appropriate sample allocation
the variance of the stratified estimator may be reduced up to 30% off of the
standard, unstratified estimator.
