From the following facts, calculate what Ann Frost must pay Blue Co. for the purchase of a

Question:

From the following facts, calculate what Ann Frost must pay Blue Co. for the purchase of a dining-room set. Sale terms are 2/10, n/30.
a. Sales ticket price before tax, $4,000—dated April 5.
b. Returned one defective chair for credit of $400 before any taxes on April 8.
c. Paid bill on April 13.