64.
Last year, Geeta’s monthly salary was ₹12,000 and Seeta’s monthly salary was ₹10,000. This year, Geeta’s monthly salary is ₹14,400, while Seeta’s monthly salary is ₹12,500. If the percentage increase in Seeta’s monthly salary this year over her monthly salary last year is denoted by x%, and the percentage increase in Geeta’s monthly salary this year over her monthly salary last year is denoted by y%, then what is the value of (x − y) / y × 100%?