Answer:
buying 100 at a time will save the company $900 per year
Explanation:
Buying all 100units=100*$100=$10000
Buying 10 at a time=10*$120=$1200*10=$12000
Inventory cost at 25% for all 100 units= 0.25*10000=$2500
Inventory cost at 25% for 10 at a time=0.25*12000=$3000