What and how to point out the stages of production on the graph if the MPP are $5, $12.50, $5, $2.50, $1 and -$2. The APP are $5, $8.75, $7.50, $6.25, $5.20 and $4. The TPP are 10/2, 35/4, 45/6, 50/8, 52/10 and 48/12. How to show graphically show the point of diminishing returns on both TPP and MPP clearly label both as "point D".? Also what level of input usage does diminishing return? (i. e. Where is the X=