Run Microsoft Excel Solver on the transportation problem below and see if you can improve on the solution. At optimality, how many units are shipped from Houston to Denver? Round and enter your answer to the nearest integer value.

Destination

$\backslash$table$[[$Source$,$Denver,Yuma,Supply$],[,,$$$2,$$$8,10],[$Houston$,10],[,,$$$4,10$$$,20],[$St$.$ Louis,$10],[,,$$$6,$$$,],[$Chicago$,,,10,30],[$Demand$,20,20,]]$

your solution at optimality? Round and enter your answer to the nearest integer value. Enter your answer without any currency

signs. For example, if you want to enter $$123\mathrm{.}45$ as your answer, just type in $123.$