7-30 Materials and manufacturing labor variances, standard costs. Dunn, Inc., is a privately held furniture manufacturer. For August 2017, Dunn had the following standards for one of its products, a wicker chair: Standards per Chair Direct materials 2 square yards of input at $5 per square yard Direct manufacturing labor 0.5 hour of input at $10 per hour The following data were compiled regarding actual performance: actual output units (chairs) produced, 2,000; square yards of input purchased and used, 3,700; price per square yard, $5.10; direct manufacturing labor costs, $8,820; actual hours of input, 900; labor price per hour, $9.80. 1. Show computations of price and efficiency variances for direct materials and direct manufacturing labor. Give a plausible explanation of why each variance occurred