Final answer:
The cost of 1 beaker is £186.67 and the cost of 1 test-tube is £140.
Step-by-step explanation:
Let's first calculate the cost of one beaker by dividing the total cost charged to Zack by the number of beakers he broke: £560 / 3 beakers = £186.67 per beaker.
Next, we'll calculate the cost of one test-tube by dividing the total cost charged to Zack by the number of test-tubes he broke: £560 / 4 test-tubes = £140 per test-tube.
For Tim, we'll follow the same steps: £490 / 2 beakers = £245 per beaker, and £490 / 5 test-tubes = £98 per test-tube.
So the cost of 1 beaker is £186.67 and the cost of 1 test-tube is £140.