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Let the cms tree grows each year be x height of tree after 7 years = 7x+90 height of tree after 6 years = 6x+90 therefore 7x+90 = 9(6x+90) i.e. 7x+90 = 54x+810 i.e. 54x-7x = 810-90 i.e. 47x = 720 i.e. x = 15.3 at the end of 12 years height = 90+12*15.3 = 273.6