Computer services company

Computer Sciences Corp.

(CSC)

was down 22.4% in preopen

Instinet

trading after warning that fourth-quarter earnings would fall in a range of 35 cents to 37 cents a share, well below the 92 cents expected by analysts and the year-ago figure of 84 cents.

The company also said revenue will grow about 11% to 13% over the same period last year, and it announced plans to cut 700 to 900 jobs.