IMO,

PV for A,B,C is 3+5+4=12 days and EV is 100% of 3 + 80% of 5 + 0% of 4 = 7, so SPI = 7/12 = 0.58

But dont see this answer in the options :(

 http://pmzilla.com/confusing-questions-and-answers

see q 3 explained

There are multiple rules for deciding the percentage complete:-

• 0-100 Rule: According to this rule, the %complete of the task will either be 0 or 100. On start of the task, %complete is 100.  Throughout the duration of task, %complete remain 0%, and on closure of task, %complete changes from 0 to 100.
• 50-50 Rule: According to this rule, as soon as the task is started, the %complete of the task is set to 50%. Throughout the duration of the task, %complete will remain 50%, and on closure of the task, %complete of task will be set to 100%

For solving the question, we need to apply 0-100 rule.

Now, as mentioned in the question, you had planned to have tasks A, B and C completed. So,

PV = PV of Task A + PV of task B + PV of task C

---PV = 3 * 100 + 5 * 100 + 4 * 100

---PV = 1200

EV = EV of task A + EV of task B + EV of task C

---EV = 3 * 100 + (Task B is only 80% complete, and as per 0-100 rule, the %complete of this task is 0) + 0

---EV = 300 + 5 * 0 + 4 * 0 = 300

SPI = EV/PV = 300/1200 = 0.25

So, the answer is A.

Regards,

Hemant, PMP

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