The selling price of a t-shirt after one month markdown is 
Further explanation:
Given:
The store marks up price 
Cost of a t-shirt is 
The store reduces the selling price by 
Explanation:
The store marks up the price by 
Decimal representation of
is as follows,

The store marks up the price can be obtained as follows,

Cost of a shirt after markup price,

The store reduces the selling price of the shirt by 
Markdown price can be obtained as follows,

The selling price of the t-shirt can be obtained as follows,

The selling price of a t-shirt after one month markdown is 
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Answer details:
Grade: High School
Subject: Mathematics
Chapter: Profit and Loss
Keywords: department store, purchases, screen-printed t-shirt, cost, store marks up, 150%, $5, every month, reduces the selling price, monthly markdown.