For flat-panel TVs, assume the number of households in the U.S. will grow to 150 million. A consumer survey predicts that 70% of the households would buy a flat-panel TV at an average price of $500, and each household would buy one TV every 5 years (meaning every year each household's annual purchase rate is 20%). Suppose the current market demand of flat-panel TVs is $3 billion. Then what is the Marketing Development Index for flat-panel TV? 11.4 87.5 3.5 28.6