Question 14
Jack’s salary in June was $\$4000$. He spent 40% of his salary on rent, 15% on transport, 20% on food and saved the rest. In July his salary was increased. The amount of money he spent on rent and transport for July remained the same. However, he spent $\$400$ more on food. If Jack saved the remaining 20% of his salary in July, find the percentage increase in his salary.
**Editorial note for this self-study exercise:** Enter the percentage increase as a number without a percent sign. Use a decimal point if entering a decimal, for example 1.25.
**Editorial note for this self-study exercise:** Enter the percentage increase as a number without a percent sign. Use a decimal point if entering a decimal, for example 1.25.