Using the midpoint formula find:

a$)$ Find the demand elasticity between points B and C using the midpoint formula, and say whether elastic, inelastic or unit elastic.

b$)$ Find the demand elasticity between points C and D using the midpoint formula, and say whether elastic, inelastic or unit elastic.

c$)$ Find the supply elasticity between points D and E using the midpoint formula and say whether elastic, inelastic or unit elastic.

d$)$ Find the supply elasticity between points A and B$$ using the midpoint formula and say whether elastic, inelastic or unit elastic.