At a book fair, Danesh buys three pencils that cost Tk. 3.25 each, and a color pen that costs Tk. 5 . Which expression represents the amount of change , he should get when paying with a twenty taka note?

At a book fair, Danesh buys three pencils that cost Tk. 3.25 each, and a color pen that costs Tk. 5 . Which expression represents the amount of change , he should get when paying with a twenty taka note? Correct Answer 20- 3(3.25) -5

He has 20 tkHe buys three pencils that cost tk. 3.25 each so the cost of 3 pencils = 3(3.25)And also a color pen that costs tk. 5 .So, he should get  = 20-3(3.25)-5 
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