Equation for Letters equating to figures

In row 1, column "A" (question) " how much is that " ,column "B" (Answer) for instance letter "G" and in column "C", letter " G" equates to let's say 37.50.

Column. ..... A........B.......C
Row1. ..... Question...G......37.50

Note to all participants:

j0SAND and Bailymaus are the same person.