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Here are the steps to integrate your form to paypal:
1. Add Calculation Widget that will compute the Total amount ordered by your client.
2. Setup your Calculation widget formula: (Birthday Cake * 45) + (Pie * 20).
2. Hide the Calculation Widget so user cannot see this field.
3. Add Paypal Payment field.
4. Setup Paypal Payment to Collect Donations/Custom Amount Payments, uncheck This is a donation. We are a non-profit organization. option and set Get Amount From to the Calculation Widget field.
Do let us know if you need further assistance.