How Can I Create Preset Donation Form Amount Calculations

I am currently setting up a form just like the following:

http://form.jotformpro.com/form/43063975533964

However I need to set a minimum amount of $35 for the custom amount checkbox field.

I attempted to do so via making a condition on the calculation amount however, this causes the donation form to stop working. The radio button amounts are not working after a condition is placed on the calculation.

Is it possible to create a form that has this capability?

You can do this by using a second calculation field and conditional logic.

Basically, you would need to compare if the checkbox value is higher or lower than $35 and then insert the value into the second calculation widget accordingly depending on the met condition.

Something like this form: http://form.jotformpro.com/form/50954023676963. If this is how you want your form to work, feel free to clone it to your account to inspect it further.

If not, please let us know the modifications you would like to implement and we'll happy to provide further assistance.