Answer: The percentage of the guests at this hotel called for room service yesterday is 40% - Step-by-step explanation: We are given total number of guests called for room services =170 total number of guests did not called for room services =255 now, we can find total number of guests Total number of guests =(total number of guests called for room services)+(total number of guests did not called for room services) so, total number of guests is =170+255 =425 now, we can find percentage percentage of the guests at this hotel called for room service yesterday is %40 So, The percentage of the guests at this hotel called for room service yesterday is 40%