Ambiguous bonus calculation Steps:

• Calculate base pay: 40 hours × $8/hour =$320.
• Calculate target time for 90 units: 90 units × 30 minutes/unit = 2,700 minutes = 45 hours.
• Calculate time saved: 45 hours – 40 hours worked = 5 hours.
• The "50% bonus for time saved producing each unit" lacks a clear formula (e.g., 50% of saved time value at full rate yields $20 bonus and$340 total, not an option).

Why B is correct:

• Problem provides insufficient details on bonus computation, making exact earnings indeterminate; B ($332) may reflect an unpublished interpretation like partial saved time valuation.

Why the others are wrong:

• A: Ignores bonus entirely (base pay only).
• C: Assumes straight piece rate at target time ($4/unit × 90 =$360), disregards actual hours worked.
• D: Likely overstates bonus (e.g., base + full saved time pay + extra = $416).

Final answer: Not enough information.