Hugo views donuts and coffee as perfect complements: He always eats one donut with a cup of coffee and will not eat a donut without coffee or drink...

30. Hugo views donuts and coffee as perfect complements: He always eats one donut with a cup of coffee and will not eat a donut without coffee or drink coffee without a donut. Derive and plot Hugo"s Engel curve for donuts. How much does his weekly budget have to rise for Hugo to buy one more donut per week?