gfRepeater_repeatRepeater(formId, repeater2Id);
  Repeats the repeater once.

gfRepeater_unrepeatRepeater(formId, repeater2Id, repeater2ChildId);
  Un-repeats the repeater once. repeater2ChildId is optional.

gfRepeater_repeatRepeaterTimes(formId, repeater2Id, timesX);
  Repeats the repeater a number of times.

gfRepeater_unrepeatRepeaterTimes(formId, repeater2Id, timesX);
  UnRepeats the repeater a number of times.

gfRepeater_setRepeater(formId, repeater2Id, timesX);
  Repeats or unrepeats the repeater to get it to whatever timesX is.

gfRepeater_select(formId, repeater2Id, repeatId, childId, inputId);
  Selects an element depending on the variables passed. All variables are optional besides formId. inputId also accepts '*' to select all inputs.

gform_repeater2_before_repeat - Fires right before a repeater is about to be repeated.
gform_repeater2_after_repeat - Fires right after a repeater has been repeated.
gform_repeater2_before_unrepeat - Fires right before a repeater is about to be un-repeated.
gform_repeater2_after_unrepeat - Fires right after a repeater has been un-repeated.
gform_repeater2_init_done - Fires after the repeater is done setting up. Also fires on the window when all repeaters are done setting up.

gfRepeater_repeater2s
[formId]
    [repeater2Id]
        ['data'] - Contains different data to keep track of.
            ['repeatCount'] - The number of times the repeater has been repeated.
            ['prevRepeatCount'] - If the form has already been submitted and failed validation, this will contain the repeatCount from before the from was submitted, otherwise it will be null.
            ['childrenCount'] - The number of children fields that get cloned everytime the repeater is repeated.
            ['paremCount'] - The highest field ID that has had their prepopulate paremeter set.
            ['tabIndex'] - The tabindex that was assigned to the repeater start field and will be assigned to all children.
            ['inputData'] - Contains an array with all of the input names in the repeater.
        ['settings'] - Contains the different settings that are set in the form editor.
            ['start'] - The number of times the repeater should be repeated when the form is loaded.
            ['min'] - The minimum number of times the repeater can be repeated.
            ['max'] - The maximum number of times the repeater can be repeated.
        ['controllers'] - Contains different elements that I like to call controllers.
            ['add'] - The add button.
            ['remove'] - The remove button.
            ['data'] - The hidden element that stores data to be passed to PHP.
            ['start'] - The start of the repeater.
            ['end'] - The end of the repeater.
        ['children'] - Contains the children fields that get cloned everytime the repeater is repeated.
            [childId]
                ['element'] - The field element.
                ['id'] - The field HTML id.
                ['idNum'] - The field ID number.
                ['inputCount'] - The number of inputs the child contains.
                ['inputMask'] - The field's input mask.
                ['required'] - True or False depeneding on if the field is required or not.
                ['type'] - The field type.
                ['inputs'] - Contains all of the inputs that the child contains.
                    [inputId]
                        ['element'] - The input element.
                        ['id'] - The input HTML id.
                        ['name'] - The input name.
                        ['defaultValue'] - The default value for the input.
                        ['prePopulate'] - Array containing prepopulate values.

jQuery('#gform_6 #input_6_7').change(function(){
    var attendees = jQuery(this).val();
    gfRepeater_setRepeater(6, 1, attendees);
});

jQuery('#gform_9').on('gform_repeater2_after_repeat gform_repeater2_after_unrepeat', function(event, repeater2Id, repeatId){
    if (repeater2Id == 1) {
        var repeatCount = gfRepeater_repeater2s[9][1]['data']['repeatCount'];
        var totalPrice = 27.47 * repeatCount;
        jQuery('#gform_9 #input_9_4').val('$'+totalPrice);
    }
});

add_filter( 'gform_field_value_parem', 'your_function_name' );

add_filter( 'gform_field_value_parem3', 'your_function_name' );