Adriana Corporation manufactures football equipment. In planning for next year, the managers want to understand the relation between activity and overhead costs. Discussions with the plant supervisor suggest that overhead seems to vary with labor-hours, machine-hours, or both. The following data were collected from last year's operations:

Month	Labor-Hours			Machine-Hours			Overhead Costs
1		730			1,348		$	102,681
2		710			1,403			103,714
3		685			1,529			109,858
4		740			1,443			108,203
5		770			1,590			116,299
6		750			1,570			114,538
7		735			1,381			106,991
8		730			1,306			102,144
9		715			1,458			106,328
10		800			1,550			113,065
11		670			1,290			96,765
12		715			1,606			108,615

Required:
(a)	Use the high-low method to estimate the fixed and variable portions of overhead costs based on machine-hours. (Round your variable cost answer to 2 decimal places. Omit the "$" sign in your response.)

Variable cost (per machine hour)	$
Fixed cost	$

(b)	Managers expect the plant to operate at a monthly average of 1,500 machine-hours next year. What are the estimated monthly overhead costs, assuming no inflation? (Use rounded variable cost. Omit the "$" sign in your response.)

Overhead costs

$