Perplexity 🤖

Hi, I'm new to php. I'm trying to make a basic budget calculator. On the first page you can select the number of income and expense sources. On the second page you must specify the amount per income or expense. I have one drop down menu where you can select the amount of income and one with the amount of expenses. Each source has its own drop down. I now have to get the amounts specified in the drop down menus and calculate the annual income and expenses in a following page. I also have to do a graphical representation of the income and expenses. Anyone have some suggestions on how to gow to work? ???