18. The following materials standards have been established for a particular product: Standard quantity per unit of output..........9.6 meters Standard price...... ..... $14.80 per meter The following data pertain to operations concerning the product for the last month: Actual materials purchased ...... 2,600 meters Actual cost of materials purchased......... $37,830 Actual materials used in production ........... 2,200 meters Actual output.... ..... 400 units Required: a. What is the materials price variance for the month? b. What is the materials quantity variance for the month