I wrote the requirements I provided a brief that someone did before so you can get ideas

Sheet1

Perfect Competition					Price =	$7.00			TC = 6.25 Q + .25 Q2
Number of Units Sold	Total Revenue	Marginal Revenue	Marginal Cost		Total Cost	TR - TC = Profit
0	$0.00				$0.00
1	$7.00	$7.00	$6.50		$6.50	$0.50
2	$14.00	$7.00	$7.00		$13.50	$0.50
3	$21.00	$7.00	$7.50		$21.00	$0.00
4	$28.00	$7.00	$8.00		$29.00	-$1.00
5	$35.00	$7.00	$8.50		$37.50	-$2.50
6	$42.00	$7.00	$9.00		$46.50	-$4.50
		)
			P = 20 -	2.50	Q
Less-than-Perfect Competition									TC = 6.25 Q + .25 Q2
Number of Units Sold	Total Revenue	Marginal Revenue	Marginal Cost		Total Cost	TR - TC = Profit
0	$0.00	$0.00			$0.00	$0.00
1	$17.50	$17.50	$6.50		$6.50	$11.00
2	$30.00	$12.50	$7.00		$13.50	$16.50
3	$37.50	$7.50	$7.50		$21.00	$16.50
4	$40.00	$2.50	$8.00		$29.00	$11.00
5	$37.50	($2.50)	$8.50		$37.50	$0.00
6	$30.00	($7.50)	$9.00		$46.50	-$16.50

Marginal Revenue 7 7 7 7 7 7 #REF! 1 Marginal Cost 6.5 7 7.5 8 8.5 9 Marginal Revenue 17.5 12.5 7.5 2.5 -2.5 -7.5 #REF! 1 Marginal Cost 6.5 7 7.5 8 8.5 9

Sheet2