Figure 1c shows that Vietnam currently produces at point X on its Production Possibility Frontier. Calculate the opportunity cost of switching from point X to point Y in terms of rice. Show your workings.
Figure 1c: Vietnam's Production Possibility Table
| Point | Coffee (000s tonnes) | Rice (000s tonnes) |
|---|---|---|
| X | 150 | 240 |
| Y | 210 | 160 |
