sales volume profit variance

Can someone answer this f2 ques:
(1) which of the following is consistent with a favorable sales volume profit variance ?
-1] actual unit sales are more than budget
-2] the unit sale budget was overstated
-3] actual profit per unit is more than budget
-4] selling price above standard but unit sales as budgeted.
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(2) In relation to a manufacturing company,are these statements true or false ?
.- the factory canteen is always a cost center.
. -A cost center is the location where all the paperwork for the costing system is accumulated.