Answer:
D. 460 ft^2
Step-by-step explanation:
Given That:
Cost of Equipment Purchased = $ 1400
useful life = 3 years
recovery rate of equipment =10%
Materials & Supplies cost ( Variable cost) = $ 2.03 / Sq.ft
If the Work is alternatively taken care (hired) by the contractor
Amount payable to contractor for the job ( variable cost ) = $ 3.25 / Sq.ft
Now;
Savings in Variable cost due to purchase of Equipment ( $ 3.25 - $ 2.03) = $ 1.22
Equipment cost to be recovered per year = Cost of Equipment / PVAF ( r%, n years)
= $ 1,400 / PVAF ( 10%, 3years)
= $ 1,400 / 2.49
= $ 562.25
Minimum usage required = Cost of equipment to be recovered per year / Savings in variable
= $ 562.25 / $ 1.22
= 460.85
Minimum usage to be worth for purchasing equipment = 460 ft²