During the course of an audit engagement, Mr. Command, the senior, decided to use non-statistical sampling on a certain substantive test. The sampling plan included the following:

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Required: a. If the sample mean is $1,800 and mean estimation is used, the estimate of the population total is $ b. If ratio estimation is used and (1) the recorded amount of the sample is $200,000 and (2) the audit amount of the sample is $210,000, the estimate of the population total is $ c. If difference estimation is used and (1) the recorded amount of the sample is $200,000 and (2) the audit amount of the sample is $195,000, the estimate of the population total is $