sir,another qu of bpp mock xm no.2, qu no 9 (sec A) says, actual quantity of materials at standard price 103500$, actual quantity of materials at actual price 103250$, actual yield at standard materials cost 102500$, standard yield from actual input of materials at standard cost 100000…. what is the materials mix variance for the period?? ans says $3500(a)…I could not understand.