The production possibility boundary below shows the possible combinations of Capital Goods and Consumer Goods that an economy can produce.

The economy is currently producing OX OX\,OX units of Capital Goods and OS OS\,OS units of Consumer Goods. If it decides to increase its production of Capital Goods to OYOYOY, the opportunity cost in terms of Consumer Goods would be
STSTST
OTOTOT
XYXYXY
OSOSOS