A 10% monthly salary increase resulted in a Tk. 9,000 per year increase in salary for an employee. What was his monthly salary before the increase?

A Tk. 7,500
B Tk. 9,000
C Tk. 5,000
D Tk. 12,000

Correct Answer: Tk. 7,500

Yearly increase = 9000 tk   Monthly increase = 9000/12 = 750 tk 10% of Salary is = 750 tk 100% of Salary is = (750×100)/10 = 7500 tk 
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