I'm not sure if I am doing this correctly please help. Please show the formulas and any calculations that you do I'm really confused. Thank you so much I really appreciate it!

Jessica spends her entire weekly budget of $20 on coffee and donuts. A cup of coffee is priced at $1, and a donut is priced at $2. Jessica's Marginal Utility from consuming a cup of coffee is 6 Utils and her marginal utility from consuming a donut is 4 Utils. A. Calculate Jessica's marginal utility per dollar spent on coffee and donuts. Show all formulas and your calculations. B. Which good give her more 'Bang for her Buck? C. What advice could you give Jessica to help her increase her overall satisfaction from the consumption of Coffee and Donuts