The Chineke Group of Company manufactures two products, namely product B and product P, and provides you with the following information:

	Prod. B	Prod. P
Selling price per unit	80.00	50.00
Less cost of sales:
Direct material A @ R5.00 per kg	15.00	10.00
Direct material B @ R4.00 per kg	8.00	12.00
Direct labour @ R6.00 per hour	12.00	6.00
Variable manufacturing overhead @ R5.00 per labour hour	10.00	5.00
Fixed manufacturing overhead per unit	5.00	5.00
Gross profit	30.00	12.00
Less sales & administrative costs:
Variable	6.00	4.00
Fixed	10.00	5.00
Net profit per unit	14.00	3.00

Take note of the following constraints:

Material A available 360 kg

Material B available 360 kg

Labour hours available 360 hours

Sales units:

Product B: a maximum of 90 and at least 20 units

Product P: a maximum of 80 and at least 10 units

Required:

Calculate the optimal production size for product B, using the graphical method.

NB: You are not required to enter the unit or currency symbol.

Provide your answer in numerical form, with no spaces in between. For example: 1000.