How to calculate a value depending on the selection of a radio button widget

I am trying to use some widget to use fancy image check boxes (morning slot) and (afternoon slot).  There is no way in that widget to assign values to the selection.

But I can show or hide a number field based on the selection. Is there a work around to allow me to add a value to the morning slot selection to a calculation field?

One thought was to put the value in a hidden field.  But first I dont want to show it if they select it.  And two the calculation field adds it no matter if it is hidden or not. Thanks

A workaround that I can think of is using conditional logic to set a different value on a textbox (hidden if you want to) depending on the selection of the radio button widget.

Then you can use the value of the textbox in your calculation tool.

Please take a look at this cloned version of your form: http://form.jotformpro.com/form/43315309793963, feel free to clone it if you want to.

Let us know if this helps.
Thank you.