NAIROBI (Reuters) - The maximum price of Kenyan grade AA coffee fell at auction on Tuesday to $350 per 50-kg bag from $357 at last week's sale, the Nairobi Coffee Exchange said on Tuesday. Kenyan beans, which are of high quality, are sought after by roasters who blend them with coffee from other regions, helping the relatively small east African producer punch above its weight in global markets. Grade AA fetched $203-$350 per bag compared with $157-$357 at last week's auction, the exchange said in a market report. Grade AB coffee went for $189-$271 per bag from $142-$299 at the previous sale. The average price of all the coffee bought inched up to $238.07 from $204.82 last week. GRADE THIS SALE ($) AVERAGE PRICE ($) PREVIOUS SALE($) AA 203-350 273.26 157-357 AB 189-271 251.49 142-299 C 185-263 231.67 90-260 PB 204-267 245.34 146-273 T 63-225 184.74 51-216 TT 182-257 224.74 101-258 (Writing by James Macharia; editing by James Macharia)