12 After a pay rise Mr Jones’ salary was
What was his salary before the pay rise?

To find Mr. Jones’ salary before the pay rise, you can set up the relationship where his post-pay rise salary (£29,455) is equal to his original salary plus 7.5% of that original salary. Thus, if we denote his original salary as :

Combining like terms leads to:

Now, divide both sides by 1.075 to solve for :

Calculating that gives:

So Mr. Jones’ salary before the pay rise was approximately £27,400.

Additionally, if you want to visualize these percentages better, think of as in decimal form. When calculating salary increases, always remember to convert percentages to their decimal equivalents for accurate calculations! This little trick can save you not only time but also prevent headache-inducing mistakes.