Answer:
The real price of recycled aluminuma. decreased, so it became less scarce
Explanation:
The price increase has been in the ratio
900 / 800 . But this increase also includes the effect of inflation . So if we exclude the effect of inflation , this ratio will reduce to
(900/800) x (120 / 138)
= .978
So in real terms , there has been a decrease in the price level ,.
In percentage terms this decrease i -.978 = 2.2% . The real price of recycled aluminuma. decreased, so it became less scarce