The graph below shows data for the production of pineapples for an individual firm operating in a perfectly competitive market.

Graphing window shows horizontal axis: 0 to 80, vertical axis: -10 to 320. Start Graph, Color blue

x	y
10	30
9	27
8	24
7	21
6	18
5	15
4	12
3	9
2	6
1	3
-0	-0

Start Graph, Color blue

x	y
20	60
19	57
18	54
17	51
16	48
15	45
14	42
13	39
12	36
11	33
10	30

Start Graph, Color blue

x	y
30	90
29	87
28	84
27	81
26	78
25	75
24	72
23	69
22	66
21	63
20	60

Start Graph, Color blue

x	y
40	120
39	117
38	114
37	111
36	108
35	105
34	102
33	99
32	96
31	93
30	90

Start Graph, Color blue

x	y
50	150
49	147
48	144
47	141
46	138
45	135
44	132
43	129
42	126
41	123
40	120

Start Graph, Color blue

x	y
60	180
59	177
58	174
57	171
56	168
55	165
54	162
53	159
52	156
51	153
50	150

Start Graph, Color blue

x	y
70	210
69	207
68	204
67	201
66	198
65	195
64	192
63	189
62	186
61	183
60	180

Start Graph, Color blue

x	y
80	240
79	237
78	234
77	231
76	228
75	225
74	222
73	219
72	216
71	213
70	210

Graphing window shows horizontal axis: 0 to 80, vertical axis: -10 to 320. Start Graph, Color red

x	y
10	30
9	28
8	26
7	24
6	22
5	20
4	18
3	16
2	14
1	12
-0	10

Start Graph, Color red

x	y
20	40
19	39
18	38
17	37
16	36
15	35
14	34
13	33
12	32
11	31
10	30

Start Graph, Color red

x	y
30	60
29	58
28	56
27	54
26	52
25	50
24	48
23	46
22	44
21	42
20	40

Start Graph, Color red

x	y
40	90
39	87
38	84
37	81
36	78
35	75
34	72
33	69
32	66
31	63
30	60

Start Graph, Color red

x	y
50	130
49	126
48	122
47	118
46	114
45	110
44	106
43	102
42	98
41	94
40	90

Start Graph, Color red

x	y
60	180
59	175
58	170
57	165
56	160
55	155
54	150
53	145
52	140
51	135
50	130

Start Graph, Color red

x	y
70	240
69	234
68	228
67	222
66	216
65	210
64	204
63	198
62	192
61	186
60	180

Start Graph, Color red

x	y
80	310
79	303
78	296
77	289
76	282
75	275
74	268
73	261
72	254
71	247
70	240

Graphing window shows horizontal axis: 0 to 80, vertical axis: -10 to 320. Start Graph, Color black

x	y
10	-0
9	-1
8	-2
7	-3
6	-4
5	-5
4	-6
3	-7
2	-8
1	-9
-0	-10

Start Graph, Color black

x	y
20	20
19	18
18	16
17	14
16	12
15	10
14	8
13	6
12	4
11	2
10	-0

Start Graph, Color black

x	y
30	30
29	29
28	28
27	27
26	26
25	25
24	24
23	23
22	22
21	21
20	20

Start Graph, Color black

x	y
40	30
39	30
38	30
37	30
36	30
35	30
34	30
33	30
32	30
31	30
30	30

Start Graph, Color black

x	y
50	20
49	21
48	22
47	23
46	24
45	25
44	26
43	27
42	28
41	29
40	30

Start Graph, Color black

x	y
60	0
59	2
58	4
57	6
56	8
55	10
54	12
53	14
52	16
51	18
50	20

Start Graph, Color black

x	y
70	-30
69	-27
68	-24
67	-21
66	-18
65	-15
64	-12
63	-9
62	-6
61	-3
60	0

Start Graph, Color black

x	y
80	-70
79	-66
78	-62
77	-58
76	-54
75	-50
74	-46
73	-42
72	-38
71	-34
70	-30

Label "Quantity of pineapples" at pixel coordinates (175,0).Label "$" at pixel coordinates (0,170).

The red line shows:

 

Hint

The blue line shows:

 

Hint

The black line shows:

 

Hint

At what quantity does this firm maximize its profit?

NOTE: If there are two quantities with the same level of profits, pick the larger of the two quantities!

 

Hint