Nora wants to figure out how many loaves of apple strudel loaf she should bake to maximize her profits from her booth at a neighborhood fair. She has calculated her total sales to be s(x) = x(8 − 0.05x) where x is the number of loaves sold. Her expenses were $20 to rent the booth and $1.50 for each loaf of bread in materials and energy costs for baking. Find a function rule, f(x) that models Nora's profit (sales − expenses).