For the following situation, find the awerage monethly expense that you would use in budpeting for the given erpense Note. Amual moans cnce a yoar, and semiannual means twice a yoar. Sara pays \$4200 for tuition and foes for each of the the semestars, plus an addtional S420 tor textbooks each semestor. The averago monthly cost for tulion and fees and toxtbooks is ? (Round to the nearest dotiar as needed)