A Purchaser Was Offered Terms of Trade Credit of 2/10

Multiple Choice

A purchaser was offered terms of trade credit of 2/10, net 30, with an invoice date of January 1.Which one of the following acts threatens creditworthiness?

A) Taking the discount, paying on January 5.
B) Taking the discount, paying on January 10.
C) Ignoring the discount, paying on January 30.
D) Ignoring the discount, paying on February 9.