3. The equation of the production function for calculators is q = 5KL + 30L, where is total output, Kis capital and Lis labour. If a firm that produces calculators wishes to produce 650 units of output and its capital stock is fixed in the short run at 20 units, how many units of labour should it hire? a) Five units of labour should be hired. b) Ten units of labour should be hired. c) Twenty units of labour should be hired. d) Thirty units of labour should be hired