这个题算出来和答案不一样

NO.PZ201909300100000106

B.

$82,500.

C.

$127,500.

解释：

C is correct.

Execution cost is calculated as the difference between the cost of the real portfolio and the paper portfolio. It reflects the execution price(s) paid for the number of shares in the order that were actually filled or executed. The execution cost is calculated as:
Execution cost = $\sum S_jP_j-\sum S_jP_d$
= [(10,000 shares × $40.75) + (30,000 shares × $41.25) + (20,000 shares × $41.50) + (30,000 shares × $41.75)] – (90,000 × $40.00)
= $3,727,500 – $3,600,000
= $127,500