Answer:
Copper purchases in year 2 will increase due to two factors:
1) inflation in the cost of copper
2) an increase in the actual usage of copper (i.e., quantity needed).
Cost in year 1 × Change in price index:
$1,000,000 × (126 ÷ 120) = $1,050,000
The second step is to adjust for increased demand:
$1,050,000 × 1.05 = $1,102,500