Answer:
Chlorine tablets cost $54
pH test kit cos $6.6
Explanations:
Given the following parameters
Price of a bucket of chlorine tablets = $90
Price of a pH test kit = $11
Total price of chlorine tablet and test kit = $90 + $11
Total price of chlorine tablet and test kit = $101
If the manager uses a coupon that applies a 40% discount to the total cost of the two items, the amount paid in total will be;

Simplify the result to have;

Get the money paid for each item after discount;
For the bucket of chlorine;

For the price of pH test kit;

Hence the price of chlorine tablets is $54 and while the price of the pH test kit is $6.6