Month	Output (units)	Direct labor-hours
January	684	1400
February	492	820
March	660	875
April	504	670
May	612	760
June	636	765
July	648	735
August	600	660
September	648	695
October	696	710
November	672	690
December	675	700

Inbee estimates that Hankuk has a variable cost of $17.50 per direct labor-hour. She expects that Hankuk will produce 650 units in the next month, January. What should she budget as the expected variable cost? How confident is she of her estimate?