Explain the typical shapes of the marginal-benefit and marginal-cost curves. The marginal-benefit curve is

The marginal benefit curve is downward.

The marginal cost curve is upward

Explanation:

Unlike the marginal cost curve, whose slope is often upwards, the marginal profit curve is generally known by its downward slope.

The optimum allocation of resources to a given product will take place when these curves are used. MB = MC always.

answer; functional fixedness;

answerpounds of plastic to purchase 200+60-20=(240);