Best Discount Store uses the perpetual system for inventory and had a sale on account to Mark Watson of $3,000 with terms 1/10 or n/30. Before payment, Mr. Watson returned $1,000 of the merchandise. Mr. Watson paid within the discount period.

What is the amount of cash Best Discount Store received?

-$1,980
-$2,000
-$1,970
-$2,970