Maximising Profit, Optimal Production Plan

Dear All

Thank you for your support and help here in this website

I am doing Kaplan F5 Exam kit, and I would like to get more clarification about one of the question .
the question is in Section B no 205 SWEET TREATS BAKE
it is the question number two on that scenario , and it is about maximising profit and finding the optimal production plan.
Looking at the answers, I couldn’t find out how did we get the throughput contribution of 50 , 37,5 and 35 for products Brownies, Muffins and Cupcakes Respectively.

Could you please explain this for me

sorry I couldn’t attach a photo of the question here, so hopefully you have a copy of Kaplan Exam Kit and you can identify the question

Thank you in advance for your help