A customer, living in a state in which the combined tax rate is 3.3% and groceries are tax exempt, went to a grocery store and purchased a gallon of milk for $3.99, a loaf of bread for $3.79, fruit for $6.12, laundry detergent for $13.99, and toothpaste for $2.19.

a. Determine the amount subject sales tax.

b. Compute the amount owed in sales tax.

c. Calculate the total purchase price.