Question 1097605
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Let x = "cost price".


From the condition, we know that Kunal (I write it intently with the capital K, since I suppose it is the name of the person)

sold it for 0.9x rupees.


Again, from the condition, we know that 

0.9x + 60 = x*(1+0.05).


It is your equation to solve.

0.9x + 60 = 1.05x  ====>  60 = 1.05x - 0.9x  ====>  0.15x = 60  ====>  x = {{{60/0.15}}} = 400 rupees.


<U>Answer</U>.  The cost price of the shirt is Rs 400.
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In all languages, the name of person starts with the capital letter.