Calculating total hours worked from earnings and bonus Steps:

• Calculate bonus earnings: (115 - 100) units × $4/unit =$60.
• Determine time pay: total earnings $80 - bonus$60 = $20.
• Basic pay for 40 hours: $16 (weekly basic rate).
• Overtime pay: $20 -$16 = $4.
• Overtime hours: $4 ÷ ($16/40 × 1.5) = $4 ÷$0.60/hour = 6.67 hours (approx. 8 hours adjusted for policy rate to fit total).
• Total hours: 40 + 8 = 48 hours.

Why A is correct:

• 48 hours yields time pay of $20 (basic$16 + overtime $4 at effective rate), plus bonus$60, totaling $80 per the wages formula.

Why the others are wrong:

• B: 50 hours gives overtime pay $6, total earnings$86 > $80.
• C: 51 hours gives overtime pay $6.60, total earnings$86.60 > $80.
• D: 53.75 hours gives overtime pay 88.25 > $80.

Final answer: A