The results of substantive testing of sales invoices at Radiator Enterprises are as follows. The three strata correspond to different departments and the overall tolerable error is set at \$60 000. Required (a) Project the errors for each stratum and calculate the total projected error. Is the projected error material? What difference would it make if the tolerable error was set at $70000 or $50,000 ? Explain. The results of substantive testing of sales invoices at Radiator Enterprises are as follows. The three strata correspond to different departments and the overall tolerable error is set at \$60 000. Required (a) Project the errors for each stratum and calculate the total projected error. Is the projected error material? What difference would it make if the tolerable error was set at $70000 or $50,000 ? Explain