A 10% monthly salary increase resulted in a Tk. 9000 per year increase in salary for an employee. What was his monthly salary before the increase ?

A Tk. 7500
B Tk. 9000
C Tk. 5000
D Tk. 12000

Correct Answer: Tk. 7500

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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