下表显示了一名工人每天的薪资情况。

第1小时	$75
每增加一小时	$40
每完成4小时的工作，将额外支付$10。

莫里斯先生（Mr Morris）一天的薪资为$325。他工作了多少小时？ 答：___ h

1. Subtract the pay for the 1st hour from the total pay

Pay for 1st hour = $\char36{}75$
Remaining pay = $\char36{}325 - \char36{}75 = \char36{}250$

2. Determine the pay for a block of 4 hours

Pay for 1st hour = $\char36{}75$
Pay for next 3 hours = $3 \times \char36{}40 = \char36{}120$
Bonus for completing 4 hours = $\char36{}10$
Total pay for first 4 hours = $\char36{}75 + \char36{}120 + \char36{}10 = \char36{}205$

3. Calculate the remaining pay after the first 4 hours

Remaining pay after 4 hours = $\char36{}325 - \char36{}205 = \char36{}120$

4. Determine the number of additional hours worked

Number of additional hours = $\char36{}120 \div \char36{}40 = 3$ hours

5. Calculate the total number of hours worked

Total hours = $4 + 3 = 7$ hours