NATIONAL PIZZA <PIZA> CORRECTS FIGURE National Pizza Co said the seven Straw Hat Piza restaurants in Los Angeles and Bakersfield, Calif., that it announced plans to buy Friday are expected to generate annual sales of about 3,800,000 dlrs, not the eight mln dlrs the company originally announced. The company said it will convert the restaurants to Pizza Hut units. Closing is expected around March 31.