A company increases salary of an officer at 15% per year. In 2024 an employee receives 28500. what was his salary in 2022?

Question: A company increases salary of an officer at 15% per year. In 2024 an employee receives 28500. what was his salary in 2022?

Solution:
let, his saray in 2022 was 100 Tk.
at 15% increment,
salary of 2023 is = 100(1 + 15/100)
= 115 Tk.
salary of 2024 is = 115(1 + 15/100)
= 132.25
∴ his salary in 2022 was = (28500 × 100)/ 132.25
= 21550 Tk.