A firm's short-run production function is given by.
[tex] q = 3 \sqrt{l} [/tex]
where L is the number of units of labour.
If the price per unit sold is $50 and the price per unit of labour is $10, find the value of L needed to maximise profits. You may assume that the firm sells all that it produces
and you can ignore all other costs.

please help me, many thanks.​