Kropf Incorporated has provided the following data concerning one of the products in its standard cost system. Variabl manufacturing overhead is applied to products on the basis of direct labor-hours. The company has reported the following actual results for the product for September: Required: a. Compute the materlals price varlance for September. b. Compute the materials quantity variance for September. c. Compute the labor rate varlance for September. d. Compute the labor efficlency variance for September. e. Compute the varlable overhead rate varlance for September. f. Compute the varlable overhead efficlency varlance for September. (Indlcate the effect of each varlance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (l.e., zero varlance). Input all amounts as positlve values.)