How do you figure out the percentage of total? Not sure on how to get the %'s. Thanks

San Mateo Circuitry manufactures electrical instruments for a variety of purposes. The following costs related to maintaining product quality were incurred in May. Training of quality-control inspectors Tests of instruments before sale Inspection of electrical components purchased from outside suppliers Costs of rework on faulty instruments Replacement of instruments already sold, which were still covered by warranty Costs of defective parts that cannot be salvaged $20,000 31,000 13,000 7,000 16,200 6,200 Required: Prepare a quality-cost report. (Round "Percentage of Total" to 1 decimal place. Total may not be equal to 100% due to rounding.) SAN MATEO CIRCUITRY Quality-Cost Report For the Month of May Costs for May Percentage of Total Prevention cost: $ 20,000 % $ 20,000 % Training of quality control inspectors Total Appraisal cost: Inspection of purchased electrical components Tests of instruments $ % 13,000 31,000 44,000 % Total $ 0.0 % Internal failure cost: Costs of rework $ % Costs of defective parts that cannot be salvaged 7,000 6,200 13,200 % Total $ 0.0 % External failure cost: Replacement of instruments already sold $ % Total $ 16,200 16,200 93,400 Total quality costs $ %