Midend's Camera Shop has prepared the following flexible budget for September and is in the process of interpreting the variances. F denotes a favorable variance and U denotes an unfavorable variance Flexible Variances Budget Price Efficiency $25,000 $1,500U $1,800F 32,000 600F 9000 42,000 1,300U 900F Material A Material B Material 1 The explanation that lower-quality materials were purchased in most likely for Material A Material B Material both Material A and C