Answer:
less than 10 units
Step-by-step explanation:
The production function represent the diminishing marginal returns
Here diminishing marginal returns means that marginal output i.e. generated an extra unit would continue to reduce more units of input that are used
So if we add one unit of capital that increased the output by 10 units so if another unit if capital is added so it increased the output but that should be less than 10 units