Angular.js - currently selected option's value inside ng-repeat

I have entries, their json object looks somewhat like this

{ 
    'id': 5,
    'activityId': 1
}

then I have activities, their json object looks like this

{
    'id': 1,
    'name': 'Activity name',
    'rate': 1200
}

now I'm rendering entries like this

<tr ng-repeat="entry in entries">
    <td>
        <activities></activities>
    </td>
    <td>
        // here's supposed to be the rate
    </td>
</tr>

where activities is a directive that looks like this

app.directive("activities", function() {
    return {
        restrict: 'E',
        template: '<select ng-model="entry.activityId" ng-options="a.id as a.name for a in activities"></select>'
    }
});

now what would I need to do, to be able to print the rate inside my ng-repeat? Since it's an attribute of something that's inside the directive, but I need it printed outside the directive.

Thanks..