A firm purchased some equipment at a very favourable price of $30,000. The equipment resulted in an annual net saving of $1,000 per year during the 8 years it was used. At the end of 8 years, the equipment was sold for $40,000. Assuming interest at 8%, find the annual worth of the equipment. Round up to nearest dollar. Put the negative sign in your answer, but do not put in a $ sign.