the ge90-85b engine has an overall compression ratio for the core air-flow of 39.3 that is achieved with a total of 14 compression stages. (a)assuming that each stage has the same pressure ratio (this is not the real situation) estimate the pressure ratio of each stage. (b)if the stage pressure ratio could be increased by 4% what would be the compression ratio of a 14 stage compressor? (c)how many stages would be needed if the stage compression ratio were to be increased 4% and the overall pressure ratio were kept fixed at 39.3