Foster, which uses the high-low method, reported total costs of $24 per unit at its lowest activity level, when production eqaled 10,000 units. When production doubled, at its highest activity level, the total cost per unit dropped to $15. i. Foster would estimate variable cost per unit as: a. $9.00 b. $6.00 c. $0.0006 d. $0.0009 ii. Foster would estimate its total fixed cost as: a. $9.00 b. $33 c. $180,000 d. $585,000 SHOW WORK