Answer:
Buying all 100 unit will save $3,937.5.
Explanation:
Buying 100 unit
Average Inventory ( 100 / 2 ) 50 units
Purchase cost ( 100 x 100 ) $10,000
+Carrying cost ( 50 x 100 x 25%) $1,250
= Total cost $11,250
Buying 10 unit
Average Inventory ( 10 / 2 ) 5 units
Purchase cost ( 100 x 150 ) $15,000
+Carrying cost ( 5 x 150 x 25%) $187.50
= Total cost $12,500
Saving $3,937.5