The rate of ham of $6.99 per pound.
The rate of cheese is $3.99 per pound.
The rate of loaf of bread is $2.49.
The rate of gallon of milk is $2.89.
The sales tax is 4.3%.
The cost excluding the sales tax can be determined as,
The total expenditure on groceries can be determined as,
Thus, the requried total of Derrick is $12.12.