Chip Sales The worldwide sales of flash memory chips (in billions of dollars} is approximated by 53) = 4.3:: + 230-94 (o s t s 6) where t is measured in years, with t = 0 corresponding to 2002. Flash chips are used in cell phonesr digital cameras, and other products. (a) What were the worldwide flash memory chip sales in 2002, in billions of dollars? [Round your answer to two decimal places.) {b} What were the estimated sales for 2004, in billions of dollars? [Round your answer to two decimal places.)