The table below shows the weekly demand and supply schedules for a raw material that was initially in disequilibrium with a surplus of 40 tonnes.
| Price per tonne (€) | Quantity demanded (tonnes per week) | Quantity supplied (tonnes per week) |
|---|---|---|
| 12 | 80 | 160 |
| 10 | 100 | 140 |
| 8 | 120 | 120 |
| 6 | 145 | 95 |
| 4 | 175 | 65 |
The market subsequently adjusted and moved to equilibrium. What was the change in the quantity demanded?
−20-20−20
−10-10−10
202020
404040
